vt7: false rounding in invoice module

Dear devs, i describe an issue in "Invoice Module", where Grand Total result is wrong because taxes are rounded down where they should have been rounded up (see screenshot below and reproduce it with my figures on your systems). This occurs on giving a certain value for VAT (by the way: same bug for Sales or Service fee) that, if computed correctly, results in a x.xx5 value. As of it's third place after decimal point, it should be rounded up then to x.x1, but in fact is deducted in vtigers invoice module to x.x0!!! It might be, that this is mainly a displaying issue in invoice module. The correct computed amount (in my case 47.01) seems to be stored correctly in the database, because printing a pdf of the same invoice comes out with the correct computed amount of 47.01 instead of the wrongly displayed 47.00! Otherwise i can't explain this strange behaviour to myself. This error occurs from vtiger 6.5 up to latest 7.x release (probably also earlier releases)

Seems not to be the exactly same issue as previously described in #268 but might be similar soure of bug.

I really hope, that your are able to wipe out this issue before finally relasing vtiger 7.1 ce.