ENH: Warn when trying to generate doxygen documentation (latex not present)
ENH: Warn when trying to generate doxygen documentation (latex not present)

To generate images from formulas, latex must be installed on the system.

Change-Id: If21c9e7761c9bf39aa9092001ecea7f21bfdf65d

hendradarwin/ITK,heimdali/ITK,fuentesdt/InsightToolkit-dev,malaterre/ITK,zachary-williamson/ITK,richardbeare/ITK,eile/ITK,stnava/ITK,stnava/ITK,fuentesdt/InsightToolkit-dev,malaterre/ITK,zachary-williamson/ITK,PlutoniumHeart/ITK,paulnovo/ITK,eile/ITK,hendradarwin/ITK,CapeDrew/DCMTK-ITK,thewtex/ITK,GEHC-Surgery/ITK,hendradarwin/ITK,fuentesdt/InsightToolkit-dev,fuentesdt/InsightToolkit-dev,msmolens/ITK,jmerkow/ITK,blowekamp/ITK,jmerkow/ITK,CapeDrew/DCMTK-ITK,paulnovo/ITK,malaterre/ITK,jmerkow/ITK,ajjl/ITK,jmerkow/ITK,blowekamp/ITK,GEHC-Surgery/ITK,atsnyder/ITK,BlueBrain/ITK,stnava/ITK,hjmjohnson/ITK,fedral/ITK,zachary-williamson/ITK,LucasGandel/ITK,rhgong/itk-with-dom,BRAINSia/ITK,vfonov/ITK,heimdali/ITK,atsnyder/ITK,LucasGandel/ITK,heimdali/ITK,paulnovo/ITK,GEHC-Surgery/ITK,vfonov/ITK,hjmjohnson/ITK,zachary-williamson/ITK,jmerkow/ITK,malaterre/ITK,PlutoniumHeart/ITK,blowekamp/ITK,PlutoniumHeart/ITK,PlutoniumHeart/ITK,atsnyder/ITK,LucHermitte/ITK,LucasGandel/ITK,eile/ITK,jcfr/ITK,paulnovo/ITK,fbudin69500/ITK,vfonov/ITK,CapeDrew/DCMTK-ITK,eile/ITK,spinicist/ITK,zachary-williamson/ITK,LucHermitte/ITK,rhgong/itk-with-dom,LucasGandel/ITK,InsightSoftwareConsortium/ITK,LucHermitte/ITK,BRAINSia/ITK,hinerm/ITK,blowekamp/ITK,fbudin69500/ITK,thewtex/ITK,LucHermitte/ITK,spinicist/ITK,jcfr/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,spinicist/ITK,fedral/ITK,atsnyder/ITK,jcfr/ITK,eile/ITK,biotrump/ITK,thewtex/ITK,thewtex/ITK,vfonov/ITK,jcfr/ITK,zachary-williamson/ITK,fbudin69500/ITK,CapeDrew/DCMTK-ITK,blowekamp/ITK,spinicist/ITK,rhgong/itk-with-dom,LucasGandel/ITK,biotrump/ITK,blowekamp/ITK,jcfr/ITK,blowekamp/ITK,richardbeare/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,fedral/ITK,GEHC-Surgery/ITK,fuentesdt/InsightToolkit-dev,CapeDrew/DCMTK-ITK,BlueBrain/ITK,ajjl/ITK,msmolens/ITK,biotrump/ITK,hinerm/ITK,GEHC-Surgery/ITK,eile/ITK,hjmjohnson/ITK,BRAINSia/ITK,atsnyder/ITK,heimdali/ITK,fedral/ITK,biotrump/ITK,hjmjohnson/ITK,ajjl/ITK,spinicist/ITK,hinerm/ITK,spinicist/ITK,BlueBrain/ITK,eile/ITK,richardbeare/ITK,PlutoniumHeart/ITK,jcfr/ITK,stnava/ITK,fbudin69500/ITK,PlutoniumHeart/ITK,paulnovo/ITK,malaterre/ITK,jmerkow/ITK,blowekamp/ITK,msmolens/ITK,heimdali/ITK,paulnovo/ITK,LucasGandel/ITK,heimdali/ITK,eile/ITK,zachary-williamson/ITK,BlueBrain/ITK,jmerkow/ITK,stnava/ITK,stnava/ITK,stnava/ITK,fedral/ITK,vfonov/ITK,malaterre/ITK,eile/ITK,fuentesdt/InsightToolkit-dev,hendradarwin/ITK,GEHC-Surgery/ITK,zachary-williamson/ITK,Kitware/ITK,rhgong/itk-with-dom,LucasGandel/ITK,rhgong/itk-with-dom,CapeDrew/DCMTK-ITK,stnava/ITK,msmolens/ITK,hendradarwin/ITK,fbudin69500/ITK,malaterre/ITK,hendradarwin/ITK,fuentesdt/InsightToolkit-dev,jcfr/ITK,hinerm/ITK,heimdali/ITK,fbudin69500/ITK,msmolens/ITK,hendradarwin/ITK,BlueBrain/ITK,vfonov/ITK,vfonov/ITK,biotrump/ITK,fedral/ITK,malaterre/ITK,biotrump/ITK,hinerm/ITK,richardbeare/ITK,thewtex/ITK,fbudin69500/ITK,InsightSoftwareConsortium/ITK,BlueBrain/ITK,atsnyder/ITK,atsnyder/ITK,fbudin69500/ITK,GEHC-Surgery/ITK,fedral/ITK,atsnyder/ITK,ajjl/ITK,fuentesdt/InsightToolkit-dev,Kitware/ITK,biotrump/ITK,GEHC-Surgery/ITK,CapeDrew/DCMTK-ITK,richardbeare/ITK,InsightSoftwareConsortium/ITK,rhgong/itk-with-dom,BRAINSia/ITK,rhgong/itk-with-dom,CapeDrew/DCMTK-ITK,hinerm/ITK,paulnovo/ITK,fuentesdt/InsightToolkit-dev,hendradarwin/ITK,InsightSoftwareConsortium/ITK,jmerkow/ITK,zachary-williamson/ITK,paulnovo/ITK,BRAINSia/ITK,LucHermitte/ITK,LucasGandel/ITK,thewtex/ITK,hinerm/ITK,richardbeare/ITK,Kitware/ITK,atsnyder/ITK,stnava/ITK,richardbeare/ITK,ajjl/ITK,PlutoniumHeart/ITK,spinicist/ITK,hjmjohnson/ITK,BRAINSia/ITK,hinerm/ITK,CapeDrew/DCMTK-ITK,Kitware/ITK,ajjl/ITK,ajjl/ITK,msmolens/ITK,jcfr/ITK,vfonov/ITK,spinicist/ITK,ajjl/ITK,msmolens/ITK,BlueBrain/ITK,msmolens/ITK,hjmjohnson/ITK,BlueBrain/ITK,biotrump/ITK,PlutoniumHeart/ITK,LucHermitte/ITK,thewtex/ITK,Kitware/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,rhgong/itk-with-dom,fedral/ITK,hjmjohnson/ITK,Kitware/ITK,spinicist/ITK,hinerm/ITK,heimdali/ITK,LucHermitte/ITK,LucHermitte/ITK,BRAINSia/ITK