Fix up format error introduced c6494fa18f941e578a2985af1c916b411a5a13c3
Merge pull request #144 from zas/config_upgrade_fix1

Fix up format error
logview: remove log receiver when dialog is closed
logview: limit number of lines stored in memory to 50000
log, logview: use levels instead of prefixes and colorize log view output
log: use bitwise operators for log levels matching
_entries -> entries as it is used outside log module
logview: enable minimize/maximize for log dialog windows
logview: code cleanup
Let the receiver convert time to string.
_stderr_receiver(): include ':' in format string instead of each dict entry
Drop currentThreadId in stderr output
Merge pull request #143 from zas/logview

Improve logging code and display
Add config "color" section to store colors
Rename config.setting.color_* to config.color.item_*

* Add a hook in tagger.py to handle this change
* Read config.setting.color_* values, store to config.color.item_*
* Delete old options
* bump picard version to 1.3.0dev1 to force config upgrade

It serves as a test case for the recently added config upgrade handling code.
Make tag status colors configurable (not yet through UI).
Add an optional description to options.
Add simple descriptions to tag_*_fg color options
Add generators to get list of options in a section

```python
# print keys for all options in config
for key in config.Option.keys():
   print key  # key = "section/name"

# print descriptions of all options in the color section
for i in config.color.keys():
   print config.color.get_description(i)
```
Add description to itemviews colors