Merged from trunk 5597:5620

Merged from trunk 5597:5620

Use startswith and endswith to simplify code.

Fix typos from the previous commit.

purge string module from emerge (WarnerBro)

fix "" " " bug (WarnerBro)

another annoy space bug (WarnerBro)

purge string module from repoman (WarnerBro)

purge string from portage.py, fix minor bug in portage_util (WarnerBro)

Fix a typo.

Fix a typo.

Revert accidentally modified joins.

Fix more typos.

Fix another typo.

Add a few pretty basic comments on writing code, particularly things
that portage used to do (and still does) that are...a bit out of style
;) (WarnerBro)

ignore py[co] in tests (WarnerBro)

remove the last of the string module from portage.py (WarnerBro)

svn path=/main/branches/prefix/; revision=5622