implement project browser reload command
fix bug in project tool `image changes` when there were no diffs ...
fix unnecessary limit in diff command and adjust `project list` menus

- MCDiffyTextWriter>>writePatchFrom:to: imposed 10k char limit on size of method
  BaselineOfMetacello>>baseline: exceeds that limit ... get rid of limit
- `project list`
  - rename menu items
  - combing last commit log entry and status into one command
when a category is selected in Categories window, display the classes in the category...
don't auto select category anymore ... if necessary add a menu item to bring up the info about the class (category, package, configuration, etc...)
`load` and `revert` menu items implemented in project list tool
transcript logging when `save project` is canceled ...
TDGitFullHistoryBrowser is now block-based (Cmd-l recalculates list)
preparation for hooking scripts defined in /home/tode up to the Project Browser

- pushing implementation of selected project menu items (changes, save, load, revert)
  to TDProjectExtensionsDefinition where it will be possible to override these items
  with calls to the scripts in the project directory ... thus the user can customize
  the behavior of these scripts and ensure common behavior between tools and command
  line.
- commands may specify a fifth argument in their blocks to obtain the actual commandNode
  that implements the command ... primarily useful for shell nodes to determine which
  directory they are defined in ...
checkpoint ... testing /home/templates/commit script
checkpoint ... testing /home/templates/commit script
checkpoint ... testing /home/templates/commit script
checkpoint ... testing /home/templates/commit script
testing .... testing
testing .... 123
checkpoint ... 123... testing /home/templates/commit script
script testing complete ... happiness
moments away from testing the project extensions

- new hierarchy
   TDAbstractMetacelloRegistrationDefinition
    TDMetacelloRegistrationDefinition
    TDMetacelloRegistrationPlaceholderDefinition
- take bypass code out of TDMetacelloTool>>findProjectExtensionNodes
  to start testing