The flat vector of staggered solution simplifies the data access.

Fixing the location of phasefield/temperature/displacement
subvectors in phase field processes.

Fixes multiple copyright messages in the doxygen docu.

ag '\\file' -L --ignore=ThirdParty *Lib |xargs  sed -i 's/\(.*\)\\copyright/\1\\file\n\1\\copyright/'

Make the name schema consistent with the
implementation of other processes.

Clang format run on near-the-header lines.

Happy New Year

[HT] Modified the velocity calculation in order that it can be used for both the monolithic and staggered schemes.

[HT] Moved the computation of the coefficients of the heat transport equation to two new member functions.

[HT] Changed the name and the type of the material property member of HT, and

took the forward declaration of the type of that member.

[Coupling] Modified the process definitions in Process/HT for the assembly for both of the monolithic scheme and the staggered scheme.