refactored the repository layout
we need SISL for base
fix the SISL-related build options

This commit does the following:
 * external/sisl is now defined in the base package set
   as 'base' might depend on it
 * allow the user to disable SISL build by setting a global
   constant in its init.rb
 * properly disable related packages if SISL support is disabled
Updated osdeps for Ubuntu 10.04

Note, Ubuntu 10.04 does not support libboost1.38
any more. This might lead to problems.

As Ubuntu 10.04 also does not support opencv 1 any
more, the camera driver does not compile any more.
accept plain URLs in specification of research folder mount point
initial commit for the orocos-toolchain package set
update with new definition of GIT_ROOT
don't overdo the configurability, configure only the gitorious access method
disable building the test suite by default

See comment in file
define the gccxml osdep for typelib
create the Orocos/DFKI toolchain package set
fix URLs
removed specific version constrain for ubuntu/debian
rename the source name and play with imports
use #optional_dependency to link base to sisl so that users can disable it with exclude_packages
adapt for gitorious
track orogen and typelib's master
changes related to modifications from the internal packages to Rise
define a push_to URL

we can then use git:// to read gitorious, which is way faster
than ssh
add a push_to URL

This is so that we can use git:// to read gitorious, which is
way faster than ssh