Change Details:
* Make "default" a special manifest group that matches any project that
does not have the special project group "notdefault"
* Use "default" instead of "all,-notdefault" when user does not specify
manifest group
* Expand -g option help to include example usage of manifest groups
Change Benefits:
* Allow a more intuitive and expressive manifest groups specification:
* "default" instead of "all,-notdefault"
* "default,foo" instead of "all,-notdefault,foo"
* "default,-foo" instead of "all,-notdefault,-foo"
* "foo,-default" which has no equivalent
* Default manifest groups behavior can be restored by the command
'repo init -g default'. This is significantly more intuitive than the
current equivalent command 'repo init -g all,-notdefault'.
Change-Id: I6d0673791d64a650110a917c248bcebb23b279d3
Change Details:
* Switch first default group to 'all' instead of 'default'
Change Benefits:
* More consistent with default_groups in the counterpart Save() function
* Fixes bug where command 'repo manifest' added an extra 'default'
group to every output project element groups attribute. This bug was
particularly confusing for projects which had 'groups="notdefault"'
as they were output as 'groups="notdefault,default"' by 'repo manifest'
Change-Id: I5611c027a982d3394899466248b971910bec8c6b
David Holmer