Solaris 11 fix regression on ps since update #2950

Default Solaris ps doesn't provide 'ps -o ucomm'

Todo: remove or fix is_parent_of() function from  scripts/functions/support
because it also use 'ps -o ucomm'

It seem's that it is not used anymore, perhaps it may be removed in future ?
Merge pull request #3085 from cgalibern/solaris11_ps

Solaris 11 fix regression on ps since update #2950
add missing comm= for solaris support, update #3085
remove project file name from RVM_PROJECT_PATH, update #3073
unset instead of exporting empty variables, fix #3086