Attached is a patch to add pic18f14k50 and pic18f13k50 support. The patch is made against svn revision 5444 and includes the libdev library files and the headers. The patch is functional as far as I can tell (just programmed a 14k50 with some test-code). Let me know if there are things that should be altered before it can be included.
Requisites: gputils 0.13.7 (beta or better)
Limitations: The patch does not include library based adc support because that means adding a new class in the code. The adc layout is a bit more different from the larger siblings with usb support. Therefore, both processors are added in the adc.ignore file for now.
PS. Future developments: creating and submitting a USB library.