Ron Frankel in memorium

• Trap debugged-program exit like we do in bashdb
• Update debug prompt string command number after a successful cmd
• Use Dbg_ prefix more often
• Do not exit on "info var" error.
• Add gdb "info functions" and order list of properties alphabetically
• Tolerate spaces in filenames (Joachim Ansoorg)
• Update version of term-background used
• Go over readthedocs and regularize titles in zshdb Rst docs
• Go over readthedocs sphinx warnings.
• Miscellaneous small bugs and typos from dbitouze, roc007, bitwranglr, Joachim Ansorg, srinivas32, and hcaw