Replace str_fromprint() with strn_fromprint()
Start work on "keyring load" command
Fix test case doc comment
Add strn_fromhex(), improve hexvalue()

Implement fromhex() and fromhexstr() using strn_fromhex()
More progress towards keyring load command
Implement keyring load command, not working yet

Write new keyring test, fails with ERROR because assertGrep -F option is
not supported.
Improve test framework: assertGrep --fixed-strings option
Fix new keyring load test
Get new keyring dump command and test working
All keyring commands now close (free) the keyring
Add more keyring load tests, fix duplicate identity bugs
Merge "keyring load" command and other keyring improvements into 'development'