profile: multiple revisions

 * shorten PATH manipulations
 * move ~/bin to the end of PATH
 * delete long ago disabled {C,CXX}FLAGS definitions
 * rearrange comments for better density
vimrc: some dumb OS's used in 2014 still need explicit "This is UTF-8" directions
gitmodules: HTTPS everywhere
add inputrc.cygwin and hook it up in profile
bashrc: brush up history settings :lipstick:
vimrc: few tiny updates
vim bundle: add bitc/vim-hdevtools