Move contents in .bash_functions into .bash_profile.

Reason: the old content in .bash_fucntions is just
to modify PS1, the bash prompt.
It will be better to put in .bash_profile.
[freebsd91p7]

In past time, there is ever a bash idfile system to help
me for daily work.

It includes bash functions, and some scripts in ~/bin/*.

Now, I would like to take idfile resurrected to my life.

This commit is the old idfile backuped from freebsd91p7;
not confirmed if still working.