The previous implementation allowed sections and keys other than those
used by the script which led to a variety of bug reports due to typos in
the configuration. Disallow entries other than those explicitly used and
make both section and key names case-sensitive (previously, only section
names where case-sensitive).
Check that Hostname and Path are set before using them.
Addresses GitHub issues #327 and #350.
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
594bd62378