Radical.saga

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- Hotfix release

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- Major re-write of engine and adaptor interface
- Support for asynchronous operations
- Improved PTYWrapper for ssh/gsissh remote execution
- Added SLURM job adaptor
- Added Condor job adaptor

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- Fixed errors related to pbs://localhost and sge://localhost
URLs that were caused by a bug in the command-line wrappers.

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- HOTFIX: credential management for SGE and PBS. both adaptors now
iterate over SSH and GSISSH contexts as well as consider usernames
that are part of the url, e.g., pbs+ssh://olelonestar.tacc...

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- Changed documentation to Sphinx
- Removed object_type API. Python buildins can be used instead
- Updates to Filesystem API
- Added JobDescription.name attribute (as defined in DRMAA)
- Introduced stateful SSH connection substrate for PBS, SGE, etc
- Introduced support for GSISSH: pbs+gsissh://, sge+gsissh://
- Re-implementation of a (more Python-esque) attribute interface
- Fixed JobID issues, i.e., job.job_id returns 'None' in case the
job is not running instead of
- Introduced dynamic, fault-tolerant plug-in loader. If anything
goes wrong during loading of a specific plug-in (i.e.,
dependencies on 3rd party modules cannot be fulfilled, the plug-in
will just get skipped and the remaining ones will still get
loaded. Previously, a single problem during plug-in loading would
take radical.saga down.

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- Added unit-tests for SPMDVariation
- Added 'mpirun' support for local job plug-in (via SPMDVariation)
- Added some of the missing methods and flags to filesystem package
- An URL object can now be constructed from another URL object
- Fixed job.cancel()
- Wildcard support for Directory.list()