Rename some of subroutines to better reflect what they do.
Some renames were not performed because subroutine name
reflects hash key.
Subroutines name guideline:
* git_ prefix for subroutines related to git commands,
git repository, or to gitweb actions
* git_get_ prefix for inner subroutines calling git command
or reading some file in the repository and returning some output
* parse_ prefix for subroutines parsing some text (or reading and
parsing some text) into hash or list
* format_ prefix for subroutines formatting, post-processing
or generating some HTML/text fragment
* _get_ infix for subroutines which return result
* _print_ infix for subroutines which print fragment of output
* _body suffix for subroutines which outputs main part (body)
of related action (usually table)
* _nav suffix for subroutines related to navigation bars
* _div suffix for subroutines returning or printing div element
* subroutine names should not be based on how the result is obtained,
as this might change easily