Added home_link option

Added home_link option to thruk.conf and documentation.
Fixed documentation_link wording in documentation
Added bug_email_rcpt option

Added bug_email_rcpt option to thruk.conf and documentation.
Added minemap_default_link option

Added minemap_default_link option to thruk.conf and documentation.

Nice to be able to configure a default link because in large installations the current default can be quite painful to load and not what you wanted to see anyway.
Merge pull request #162 from awiddersheim/master

More configuration options and documentation additions plus new minemap_default_link option