problematic install docs
problematic install docs

Added some detail on failures resulting from UNIX shell version
problems (i.e., not running bash). Obscure, but I saw one in the wild
yesterday. The problem is that Anaconda does not know how to modify the
profile files for shells other than bash.

landlab/landlab,SiccarPoint/landlab,cmshobe/landlab,ManuSchmi88/landlab,cmshobe/landlab,decvalts/landlab,RondaStrauch/landlab,RondaStrauch/landlab,Carralex/landlab,csherwood-usgs/landlab,RondaStrauch/landlab,SiccarPoint/landlab,amandersillinois/landlab,ManuSchmi88/landlab,decvalts/landlab,landlab/landlab,cmshobe/landlab,landlab/landlab,laijingtao/landlab,amandersillinois/landlab,ManuSchmi88/landlab,laijingtao/landlab,csherwood-usgs/landlab,Carralex/landlab,Carralex/landlab