[Bash] Better detection pf ArchLinux systems
[Bash] Add a man page for bash_functions

As the number of functions available in .bash_functions increases, it
becomes more and more difficult to keep track of them. This commit adds
a asciidoc file which is converted to a manpage and installed on the
system for a quick reference to the availble functions.
{ViM] Add new mapping to remove trailing whitespaces