Add stubs for build_from_source and build_bottle installer modes
keepassc: Initial release v1.6.2

KeePassC is a curses-based password manager compatible to KeePass v.1.x and KeePassX.
(utilizes kppy-v1.4.0 and pycrypto-1.4.1)
keepassc: add 1.6.0 bottle.