* configuration is in $XDG_CONFIG_HOME/vcsh/config
* $VCSH_GITIGNORE can be set to 'exact' or 'recursive'

People arriving via http://onethingwell.org/post/14218384411/vcsh
should be able to find us..

1.7.7 is happy without parameters, 1.7.0.8 needs origin master

Conflicts:
	vcsh

* manpage
* set $VCSH_REPO_NAME (this assumes .git suffix!)

Conflicts:
	doc/error_codes.md

Instead of having use() report a normal error (which is actually fatal)
and returning >0, and calling use || exit $? everytime; just report the
fatal error and quit already

* move all backend code to separate functions
* call those functions directly
* simplify argument parsing
* remove redundant verbose begin/end messages

Introduce fatal(), error(), and info()