v7.1.6

Fixed bugs:

• fixed that SoPlex_objValueRationalString did not calculate the required string length correctly
• clear vector before modifying number of non-zeros in SSVectorBase<R>::assign2productShort() of basevectors.h to avoid uninitialized indexing
• also check whitespace at fourth position and only rely on length in row section in MPSInput::readLine() to detect more free MPS formats

Code quality:

• reorganize NameSet::number() to avoid one hash table lookup and remove false compiler warning
• avoid a false use-after-free compiler warning from GCC 12 and some more fixes of compiler warnings