filetree package structure tweaks

[dalehenrich]

• method meta information in separate method ... to make merging cleaner
• traits record
• others?

[dalehenrich]

with meta data in separate method we can also completely skip including it (author/timestamp supplied by commit object instead)

[dalehenrich]

With this commit (previous comment) we've not added a .ftree file that shows up in the root directory of a package (.tree) and indicates the version of the package structure being used. Previous version was '0.0'.

The new version is '0.1' and when present means that the timestamp for methods is stashed in a separate .meta file for each method ... in the future we can drop this file completely or write it and ignore it, etc. Method source files are required to have a .st extension.

package directories (.tree dirs) will be expect to find the timestamp data embedded in the method source file ... with or without a .st extension....

[dalehenrich]

known unimplmented visitors:

• MCFileTreeSTWriter>>visitClassTraitDefinition:
• MCFileTreeSTWriter>>visitScriptDefinition:
• MCFileTreeSTWriter>>visitTraitDefinition:

[dalehenrich]

list of unimplemented vistors moved to Issue #4 ... no need for two open bugs ...