Fix value of 'directory' attribute in manga element

When creating new configuration using 'template' command, directory name
specified with --directory flag was not propagated properly and attribute ended
with same value as 'name'.
Fix missing 'page' input into simple formats

Method for generating simple formatters should take all input paramter names,
but 'page' parameters was missing.
Fix bash completion script to work with curren version

The bash completion script is present, but was not updated for some time and it
is even not installed into debian package.

This commit adds completion file rewrite to handle new subcommands and their
options and installs it into package.

Slight change into parsing content specification for 'add' command was needed.
The content separator character can now be either ';', '/'. Bash completion
works only with later one (which does not need escapting on command line).
Update man page content

- update man page summary with missing subcommands
- update main description
- update description of subcommand options
- add examples section
Fix missing build dependencies in deb package
Update CHANGES file for 4.2.0 release