Added checksum validation of received dump
Support for different Blofeld device numbers
Added popup menu accessed by F1

* So far only About works, with a dummy Settings item to show what is possible.
Added ui and debug settings to popup menu
Added heading and reworded some items in popup menu
Now F10, Menu and mouse right click also bring up popup menu
Put About window in center of main window
Added keyboard shortcuts to popup menu
Added missing .h files to Makefile INCS
Added COPYING and boilerplate README
Cleaned up Makefile

* install target not tested however. At any rate, the application
  itself does not yet support installation in other than the CWD.
Minor cleanup of Popup and settings stuff
Added send parameter dump to Blofeld
Added Patch and Config page, implemented send/get parameter dump on page
Implemented two paste buffers (one for whole patch, one for arp)
Implemented patch clipboard copy/paste
Added patch name and category to patch/config page
Added handler for device number spin button
Added Device Config box on Patch/Config page

* Device ID spin button working, but not MIDI Device Name.
Add comment about signal handlers' return value