Bug#538717: Support SVN repositories

[Osamu Aoki]

control: tags -1 + moreinfo
control: tags -1 - patch

Hi,

uscan is getting bloated.  So we need to be careful for adding special
case handling which will be rotten soon with changing external software
interfaces.

The key functionality of uscan is scan upstream tarballs in the http/ftp
sites.  If checking against VCS tag is needed, it should be in a
separate command.  We usually do not package directly from VCS.

Also, in the upcoming multitar branch, I have implemented pagemangle
rule which can do any string substitution of web page. This may be
good enough because it allows to change "<file " into "<a " if the
upstream only provides subversion tag as the release mechanism. (I think
this is non standard case.)

As for patch, it reduces tightness of current code for all sites.
pagemangle rule is better approach.

https://anonscm.debian.org/cgit/collab-maint/devscripts.git?h=multitar

Osamu