Severs the code dependency on opm-commmon. There was no actual
functional dependency here, with the exception of some enable/disable
warning headers. To properly make opm-parser a stand-alone module the
usage of these headers have been removed and the dependency on
opm-common is gone.
Done by using the disable_warnings.h and reenable_warnings.h headers.
In some cases also a little reordering of includes, to put all boost
includes in the warning-suppressed part.
this is just the result of
```
find -iname "*.[ch]pp" | xargs sed -i "s/ *$//"
find opm/parser/share/keywords -type f | xargs sed -i "s/ *$//"
```
so if it causes conflicts with other patches, the others should get
priority. The rationale behind this patch is that some people tell
their editor to remove white space which leads to larger than
necessary patches...
