[RFC] Stage support for PEAR classes and channels

[Antoine Brodin]

Hi there,

The patch below adds stage support to pear classes and pear channels
(not devel/pear itself)
http://people.freebsd.org/~antoine/ports/stage-pear.diff

I verified on ~170 ports from devel that the content of the generated
package differs only in the timestamp in channel .reg files between
staged and unstaged.

Please comment,

Cheers,

Antoine