Act on checkgroups control messages instead of sending mail

[eagle]

The only difference between doit and mail in control.ctl configuration of checkgroups handling is whether controlchan runs the checkgroups through docheckgroups to generate a shell script first. There's no way to tell the server to just make the necessary changes.

If this is added, there should probably be a corresponding configuration option telling controlchan the maximum number of changes that could be made at one time before bailing and mailing the changes to the admin.

[Julien ÉLIE]

Syntax like that should be used:

/maxdocheckgroups/:*:*:10
/maxdocheckgroups/:*:bad-one.*|bad-two.*:5
/maxdocheckgroups/:bad-sender@address:bad-one.*:2

/maxdosignedcheckgroups/:*:*:20
/maxdosignedcheckgroups/:*:bad-one.*|bad-two.*:5

[Julien ÉLIE]

(In [8431]) Many improvements to checkgroups handling:

• Act on checkgroups control messages instead of sending mail;

• Add the /maxdocheckgroups/ control.ctl option to specify the maximum number of changes that could be made at one time before bailing and mailing the changes to the admin;

• Process all matching entries for a checkgroups and not the last matching control.ctl entry. It especially allows to use "drop" commands, combined with "mail" and "doit". To achieve that, controlchan uses exclusion and drop patterns;

• Fix a long-standing bug causing patterns not being properly handled by docheckgroups: standard grep patterns were generated by controlchan instead of *egrep* patterns!

• Fix a long-standing bug causing multiple entries for the same checkgroups sender not to be honoured (for instance aus.* and canb.*) because the last one did not match the list of newsgroups;

• Fix two wrong log matches in innreport;

• Documentation improvements, with useful samples.

close #3, #102