Enable unit and integration tests for intel

[timofeymukha]

I will regret getting into this again :D. But would be nice to put in place.

[timofeymukha]

The tests start running but hang for infinity, perfect :D

[timfelle]

Current progress:

dofmap.f90: Dofmap is not constructed correctly. Incorrect values are returned from function dofmap_facetidx.

We need to investigate contents of inputs to make sure tuple4_i4_t behaves correctly.

[njansson]

Current progress:

dofmap.f90: Dofmap is not constructed correctly. Incorrect values are returned from function dofmap_facetidx.

We need to investigate contents of inputs to make sure tuple4_i4_t behaves correctly.

This is the typical issue for Intel, and now also the issue that is shown in #2324 for llvm based CCE. I wonder if this is related to the assignment of these tuples in the hash table.

Also in the past there were some issues with the select type for tuple4_i4_t and tuple_i4_t. even with both types present in own select clauses, some compilers (incorrectly?) matched them to the same clause since they were derived from tuple_t (hence the current obfuscated construct in htable)