ippusbxd 1.34 release

This release is mainly to improve the DNS-SD advertising to equal the one of the network mode of the device and also to advertise its AirScan scanning capabilities, but we also have some communication and code base improvements.

• DNS-SD-advertise the devices capabilities based on polling the device via IPP (printing and send-fax part) and via HTTP (eSCL scanning part, if available), the records now contain the same information as the DNS-SD records which the printer broadcasts through its network connection
• Improved code base by formatting, header files, comments in the header files, and improving debug output
• Added exponential backoff for print read requests when printer's responses are empty for saving resources and reducing log file spam
• Apparmor: Matched path when bin and sbin directories are merged

ippusbxd 1.33 release

Vast improvements in the communication code contributed by David Valleau from Google (Chrome OS printing guru):

• Changed USB code to hold all IPP-over-USB interfaces as long as ippusbxd is running
• Made the communication bi-directional with polling
• Changed unregister_service_thread() to deallocate removed thread parameters
• Fixes for high-DPI web scanning (transferring large amounts of data)
• Fixed spurious recv and USB timeout errors

ippusbxd 1.32 release

Minor changes, mostly bug fixes and documentation.

• Fixed automatic search of an IPP-over-USB printer when none is specified on the command line
• Use port 60000 (and following) as default port when no port is specified
• Use URF info in the USB device ID for the DNS-SD record
• Corrected syslog() call to avoid crashes
• Minor code fixes
• Updated readme.md: Avahi patch, Mopria/Wi-Fi Direct printer support, Markdown for GitHub

ippusbxd 1.31 release

• Added missing 'TAG+="systemd"' to the UDV rules file
• Added support for the page description language PCLm in the DNS-SD record
• Make DNS-SD advertising also working in the no-printer developer mode