As suggested by seanbright, the PSEUDO_CHAN_LEN in

As suggested by seanbright, the PSEUDO_CHAN_LEN in
app_chanspy should be set at load time, not at compile
time, since dahdi_chan_name is determined at load time.

Also changed the next_unique_id_to_use to have the
static qualifier.

Also added the dahdi_chan_name_len variable so that
strlen(dahdi_chan_name) isn't necessary. Thanks to
seanbright for the suggestion.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@133169 65c4cc65-6c06-0410-ace0-fbb531ad65f3