Allow assembler to get temporaries

This changes the global GeodesicFEAssembler by storing the local assembler in a shared_ptr and make the constructor, and setter, accept l-values, r-values or shared_ptr and correctly handle the memory management.

This is useful to me when writing a factory classes.

added 319 commits

• a04d0442...efec17f3 - 316 commits from branch master
• 9800a5f5 - Allow to hand over r-values, l-values and shared_ptr and handle ownership
• 639b9b83 - Use correct field_type
• be1cc8d1 - GeodesicFEAssembler does not take raw pointers anymore

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added 3 commits

• 38134d0d - Allow to hand over r-values, l-values and shared_ptr and handle ownership
• d4fcd896 - Use correct field_type
• 8f2aeab8 - GeodesicFEAssembler does not take raw pointers anymore

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added 1 commit

• 8093a2be - GeodesicFEAssembler does not take raw pointers anymore

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merged

mentioned in commit 4c306540