fix garbage collector:
 - implemenation: see the gc docs
 - only one macro to enable the garbarge collector (in include/thread.h)
accidentally remove some code while fixing gc bug --> add back now
Fix small bug in collector.c
- this appeared while fixing GC bug
- the sync rec should be sent only when the ready stream set is empty --> otherwise, it may forward unexpected sort end. This happens when there is initial branches mixed with non-initial ones.
Fix bug in garbage collector + add SNetStreamGetId(for debugging)
 - Fix bug: "Received sort records do not match"
    This happens as the sort_end records do not pass the parallel entity
    but pass the collector entity (See the gc report for more detail)
    This is fixed by sending a special sort_end record to notify the
    paired collector when a parallel entity terminates itself.
Forgot to add the SNetStreamGetId declaration
support source/sink
 see LPEL_FLAGS for more detail
fix a small bug in lpel exclusive mode
bug: in the monitoring mode
  if T is used and S isn't, task state is always "A"
  fixed by set MonCbStream... and flag when opening stream
implement the interface for LPEL_HRC (glue_hrc.c)
originial lpel interface is in glue_decen.c
glue_snet.c: common implementations for DECEN and HRC
merge pull request #32 rcefala/fix-thread-pinning-bug
(Thread id was being passed as a pointer)
Fixed missing header file error.
Enhance the synthetic benchmark with variable workloads and number of runs.
More flexible benchmark interface.
testcase for initialiser boxes

added a testcase for init boxes (in C); the example consists of one init box in
parallel with an identity filter. No input is required, only record in input.xml
is the terminate record.
added output for checking in initbox test case
fixed unused variable and wrong format string warnings
extract from the commit of Merijn August 17, 2012
- there are two many conflicts for other files -> merge manually for
  these 2 files
New .gitignore.
Enable separation of output in the pipeline benchmark based on tag string.
Enhance the 'make compile' target for the pipeline benchmark.
Update .gitignore.