DOC: add hint about -mp ifort compiler option to INSTALL.txt
DOC: add hint about -mp ifort compiler option to INSTALL.txt

Without the 'more precise' compiler option, ifort does not insist on
ieee compliant math, according to Jerome Kieffer. so maybe this option should
always be on?

Using -mp for ifortran has a performance decrease almost reaching
GNU level, but not quite. Warned the user about this.

apbard/scipy,mingwpy/scipy,petebachant/scipy,sonnyhu/scipy,endolith/scipy,fredrikw/scipy,jakevdp/scipy,arokem/scipy,raoulbq/scipy,nonhermitian/scipy,Gillu13/scipy,ilayn/scipy,kalvdans/scipy,vhaasteren/scipy,Newman101/scipy,zerothi/scipy,FRidh/scipy,witcxc/scipy,ndchorley/scipy,sriki18/scipy,Shaswat27/scipy,dch312/scipy,cpaulik/scipy,witcxc/scipy,gertingold/scipy,woodscn/scipy,jonycgn/scipy,pizzathief/scipy,Dapid/scipy,gdooper/scipy,felipebetancur/scipy,njwilson23/scipy,mortonjt/scipy,richardotis/scipy,Eric89GXL/scipy,surhudm/scipy,e-q/scipy,newemailjdm/scipy,endolith/scipy,person142/scipy,gef756/scipy,Kamp9/scipy,pizzathief/scipy,aarchiba/scipy,Shaswat27/scipy,kleskjr/scipy,Newman101/scipy,njwilson23/scipy,gef756/scipy,Srisai85/scipy,larsmans/scipy,rmcgibbo/scipy,pizzathief/scipy,jamestwebber/scipy,gertingold/scipy,chatcannon/scipy,e-q/scipy,mortada/scipy,petebachant/scipy,Gillu13/scipy,futurulus/scipy,mtrbean/scipy,scipy/scipy,gfyoung/scipy,minhlongdo/scipy,Stefan-Endres/scipy,nmayorov/scipy,Eric89GXL/scipy,bkendzior/scipy,befelix/scipy,jsilter/scipy,WillieMaddox/scipy,piyush0609/scipy,sargas/scipy,aeklant/scipy,dominicelse/scipy,anntzer/scipy,dch312/scipy,Gillu13/scipy,vhaasteren/scipy,andim/scipy,Srisai85/scipy,vhaasteren/scipy,tylerjereddy/scipy,juliantaylor/scipy,newemailjdm/scipy,FRidh/scipy,woodscn/scipy,zerothi/scipy,anielsen001/scipy,petebachant/scipy,ChanderG/scipy,bkendzior/scipy,jseabold/scipy,apbard/scipy,jonycgn/scipy,Dapid/scipy,josephcslater/scipy,vigna/scipy,e-q/scipy,rgommers/scipy,vigna/scipy,pyramania/scipy,matthew-brett/scipy,ndchorley/scipy,jamestwebber/scipy,jjhelmus/scipy,lhilt/scipy,ChanderG/scipy,mortonjt/scipy,niknow/scipy,rgommers/scipy,dominicelse/scipy,Newman101/scipy,ndchorley/scipy,ales-erjavec/scipy,sriki18/scipy,dominicelse/scipy,rmcgibbo/scipy,bkendzior/scipy,juliantaylor/scipy,andyfaff/scipy,nvoron23/scipy,pbrod/scipy,vberaudi/scipy,mortonjt/scipy,bkendzior/scipy,mhogg/scipy,mdhaber/scipy,vberaudi/scipy,mingwpy/scipy,ortylp/scipy,argriffing/scipy,mhogg/scipy,matthew-brett/scipy,sriki18/scipy,ilayn/scipy,sargas/scipy,ChanderG/scipy,fernand/scipy,vigna/scipy,zaxliu/scipy,vberaudi/scipy,ogrisel/scipy,njwilson23/scipy,Shaswat27/scipy,person142/scipy,raoulbq/scipy,mhogg/scipy,WarrenWeckesser/scipy,aman-iitj/scipy,sriki18/scipy,lhilt/scipy,cpaulik/scipy,niknow/scipy,niknow/scipy,haudren/scipy,aarchiba/scipy,perimosocordiae/scipy,Dapid/scipy,raoulbq/scipy,piyush0609/scipy,matthewalbani/scipy,haudren/scipy,FRidh/scipy,endolith/scipy,anielsen001/scipy,mgaitan/scipy,chatcannon/scipy,futurulus/scipy,person142/scipy,Kamp9/scipy,tylerjereddy/scipy,sauliusl/scipy,FRidh/scipy,aeklant/scipy,ilayn/scipy,witcxc/scipy,sauliusl/scipy,giorgiop/scipy,Srisai85/scipy,ortylp/scipy,lhilt/scipy,mtrbean/scipy,felipebetancur/scipy,pschella/scipy,richardotis/scipy,ales-erjavec/scipy,gef756/scipy,cpaulik/scipy,sonnyhu/scipy,behzadnouri/scipy,aarchiba/scipy,jonycgn/scipy,pizzathief/scipy,mgaitan/scipy,andyfaff/scipy,raoulbq/scipy,aman-iitj/scipy,gertingold/scipy,pnedunuri/scipy,juliantaylor/scipy,vigna/scipy,trankmichael/scipy,Dapid/scipy,nvoron23/scipy,jjhelmus/scipy,matthew-brett/scipy,argriffing/scipy,nmayorov/scipy,pbrod/scipy,mingwpy/scipy,raoulbq/scipy,cpaulik/scipy,dch312/scipy,ilayn/scipy,andim/scipy,rmcgibbo/scipy,befelix/scipy,haudren/scipy,WarrenWeckesser/scipy,jamestwebber/scipy,maciejkula/scipy,larsmans/scipy,anntzer/scipy,Srisai85/scipy,rgommers/scipy,larsmans/scipy,niknow/scipy,cpaulik/scipy,richardotis/scipy,ogrisel/scipy,WarrenWeckesser/scipy,fredrikw/scipy,giorgiop/scipy,grlee77/scipy,scipy/scipy,pizzathief/scipy,Shaswat27/scipy,jor-/scipy,jonycgn/scipy,pbrod/scipy,mhogg/scipy,andim/scipy,jseabold/scipy,mortonjt/scipy,minhlongdo/scipy,Stefan-Endres/scipy,mikebenfield/scipy,jor-/scipy,hainm/scipy,mortada/scipy,argriffing/scipy,larsmans/scipy,mtrbean/scipy,zxsted/scipy,ortylp/scipy,mdhaber/scipy,andyfaff/scipy,aeklant/scipy,pyramania/scipy,chatcannon/scipy,mortonjt/scipy,mgaitan/scipy,ales-erjavec/scipy,sauliusl/scipy,jor-/scipy,apbard/scipy,anielsen001/scipy,pnedunuri/scipy,lukauskas/scipy,endolith/scipy,WarrenWeckesser/scipy,rgommers/scipy,rmcgibbo/scipy,jonycgn/scipy,dch312/scipy,kleskjr/scipy,njwilson23/scipy,efiring/scipy,matthewalbani/scipy,ChanderG/scipy,sauliusl/scipy,Kamp9/scipy,fredrikw/scipy,nonhermitian/scipy,Dapid/scipy,pbrod/scipy,sonnyhu/scipy,dominicelse/scipy,mingwpy/scipy,jseabold/scipy,pnedunuri/scipy,pschella/scipy,gef756/scipy,scipy/scipy,aarchiba/scipy,efiring/scipy,richardotis/scipy,mhogg/scipy,felipebetancur/scipy,gfyoung/scipy,josephcslater/scipy,WarrenWeckesser/scipy,woodscn/scipy,maniteja123/scipy,fernand/scipy,vhaasteren/scipy,Kamp9/scipy,hainm/scipy,vanpact/scipy,jakevdp/scipy,trankmichael/scipy,andyfaff/scipy,argriffing/scipy,maciejkula/scipy,mortada/scipy,piyush0609/scipy,jseabold/scipy,mdhaber/scipy,giorgiop/scipy,pbrod/scipy,aarchiba/scipy,mdhaber/scipy,perimosocordiae/scipy,FRidh/scipy,lhilt/scipy,njwilson23/scipy,sargas/scipy,vigna/scipy,anielsen001/sci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