Improved cmdline parameter handling and sync navigation.
Improved cmdline parameter handling and sync navigation.

* Parameter handling now handles environment variables expanded to
  file names.
* Parameter handling of Concatenated file names.
* When searching and displaying a topic, the Contents treeview is
  synchronized with that Topic.

Signed-off-by: Graeme Geldenhuys <9c5184f256fa4e0f47ed2cae81d34eab896094fe@mastermaths.co.za>

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI