fixed a very tricky bug which caused memory errors when calling
TParameter::equals on CT_VECTOR or CT_MATRIX with ST_STRING of
primitive type not equal to PT_CHAR, i.e. PT_FLOAT64.

This also fixed some integration test equaks failures since we have
cases of vectors if string, as for example in string features

Note to myelf: DON'T DEVELOP USING COPY/PASTE
Revert "Disabled integration tests on travis"

This reverts commit 1564b47cc11cc5c1a3c6a9de6a8027a0522dcc23.