Use the C++ implementation of the element class

added 3 commits

• 4d09c2d5 - Another label has to be converted to a symbol.
• 8d9efed9 - Added a class to store the share directory location.
• 13bdec78 - Set the share directory for the pseudopotential code.

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added 1 commit

• 9e704f6d - Missing include file from the Makefile.

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merged

mentioned in commit c4aaf4ef

changed milestone to %8.0