Removed unused code.
Removed unused code.
Modify setupMetab2React() in CHybridMethodODE45.cpp
-add reactions into mMetab2React[metab] whose reaction flux is changed when
 metab is updated

Modify copasi_wrapper.cpp in /COPASI/stochastic-testsuite/
-change "HybridODE54" to "HybridODE45"
-replace pScanProble->createScanItem(...) in line 252 with
 pScanProblem->addScanItem(...)
- fix for bug 1962: c export of numbers, now with max precision
- fix for bug 1964: export of function definitions used in raterules / assignment rules only.