[mb] output garbage with inline help strings

[xmailla]

mb -q or help command or even brief return some garbage take from mb script:

[mb] Reception> brief
commands/topics:
!         brief     decrypt   grep      index     new       rm        unspam
$2        cat       dirs      headers   ls        prompt    search
.         cd        extract   help      man       quit      send
//'       cp        find      inbox     mime      reply     spam
all       cur       fwd       inc       mv        restrict  sync
type msg# / sel msg# w/mouse in tmux and use . to see in new pane
use: brief for this short help again, help <topic> for longer help
sigs: ^\ (QUIT) = cur folder status, ^C (INT) = quit gracefully
[mb] Reception> help brief
brief [cmd] - print a brief usage summary/command list
[mb] Reception> help
! cmd ... - run a shell command
//' | head -1
. - a single dot displays the current message
//' | head -1
all [slice] - alias for cur
brief [cmd] - print a brief usage summary/command list
cat [msgno] - dump raw message to stdout
cd folder - switch to different folder
cp [msgno...] dest-folder - copy msg to given folder
cur [slice] - switch from new to cur in the current Maildir

This is due to how we try to extract informations from #+ strings in the script

[xmailla]

We should document which sed, grep, awk and such, to use for this to work perfectly.

I fixed all this stuff on my part but it is not really portable. Need to work it a little more before commiting my changes.

With my fix in place:

[mb] Reception> brief
commands/topics:
!         cd        extract   help      man       quit      send
.         cp        find      inbox     mime      reply     spam
all       cur       fwd       inc       mv        restrict  sync
brief     decrypt   grep      index     new       rm        unspam
cat       dirs      headers   ls        prompt    search
type msg# / sel msg# w/mouse in tmux and use . to see in new pane
use: brief for this short help again, help <topic> for longer help
sigs: ^\ (QUIT) = cur folder status, ^C (INT) = quit gracefully

No more garbage