added checks to SP packet functions
Merge branch 'michael-0921' of https://github.com/mastercoin-msc/mastercore into michael-0921
more SP-related checks
Merge branch 'michael-0921' of https://github.com/mastercoin-msc/mastercore into michael-0921
undefined MY_SP_HACK # used only for dev testing
Merge pull request #52 from faizkhan00/add-maths

add calculations for fundraiser
minor include files movement
Add fractional amounts, plus example API usage, and improvements to individual calculations