Integrate RcppBTCS with diffusion

Closes #1 (closed)

• bump to version 0.3.10
• refactor/update RepSol and Distribute to deal with sorption/exchange
• add diffusion reactive transport
• SOLUTION_MODIFY

assigned to @delucia

added 2 commits

• 534a19e5 - first integration
• 340314f6 - Added Rphree_Diffusion.R and corresponding man pages

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added 1 commit

• b62aeafd - Added SimTime, age/sorpex.R runs as expected

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added 1 commit

• 3cdf095e - BTCS works properly

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marked this merge request as ready

merged

mentioned in commit 16d9de7a