env.c
Changed env_homedir from const to char, caller is responsible for cleanup
More strict programming, using bzero
Removed const char* const in favor of const char* for functions
Bugfix. getline returns read string including \n
So set to NULL to fix this
Fixed all strict warnings introduced by Tomarus his WARNINGS-flag in the GCC makefile
Updated makefile to use right filename aci and changed standard from ISO C99 to GNU99