netkans for SCANsat with stable and development versions

As discussed in https://github.com/KSP-CKAN/CKAN/issues/398 , I provide two netkan files which conflict with each other to allow installation of pre-release versions of SCANsat.

Indexing of the pre-release versions needs https://github.com/KSP-CKAN/CKAN/issues/403 though, currently both my netkans only see v8.0 of SCANsat