Introduce move semantics to adouble, clean-up tape types, clean-up include files

[TimSiebert1]

This PR:

• implements move semantics for the tape-based derivative type adouble as proposed in Move sematics for adouble #94;
• cleans-up the tape-based ad-type system;
• cleans-up the includes.

The main idea is that adubs are completely replaced by proper treatment of r-value references. This results in the updated adouble class without the need for an inheritance structure. Thus, badouble and adub are removed.

Prior to the proposed changes, each arithmetic operation generates a new tape-location regardless of whether the input is a temporary (r-value reference) or not. This potentially lead to a significant number of "wasted" locations.

In the proposed changes and for most operations the arithmetic operation does creating a new adouble if the input is an r-value reference. To this end the operations are overloaded for r-value references, there is a move constructor and a move assignment.

As a result, an expression like 0.5 * (x + u/x), which would create in the current implementation three adub (basically adoubles) with new locations, the new version would only create a single new location and move it between the operations.

Please note that I introduce a lot of code-duplications when defining the operations for r-value references. They should be definitely removed at some point and are an item on my list 😃

[codecov]

Codecov Report

Attention: Patch coverage is 16.84699% with 538 lines in your changes missing coverage. Please review.

Project coverage is 68.47%. Comparing base (29d60c0) to head (30cb187).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
ADOL-C/src/advector.cpp	0.00%	191 Missing ⚠️
ADOL-C/src/pdouble.cpp	0.00%	185 Missing ⚠️
ADOL-C/src/checkpointing.cpp	0.00%	88 Missing ⚠️
ADOL-C/src/externfcts.cpp	50.61%	40 Missing ⚠️
ADOL-C/src/fixpoint.cpp	80.76%	10 Missing ⚠️
ADOL-C/include/adolc/adtb_types.h	78.78%	7 Missing ⚠️
ADOL-C/include/adolc/advector.h	0.00%	6 Missing ⚠️
ADOL-C/src/externfcts2.cpp	0.00%	6 Missing ⚠️
ADOL-C/src/storemanager.cpp	0.00%	3 Missing ⚠️
ADOL-C/src/taping.cpp	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
- Coverage   68.49%   68.47%   -0.02%     
==========================================
  Files          53       53              
  Lines       28596    28919     +323     
  Branches     1861     1999     +138     
==========================================
+ Hits        19586    19803     +217     
- Misses       9010     9116     +106     

Flag	Coverage Δ
unittests	68.47% <16.84%> (-0.02%)	⬇️

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