OXcalculator - Bill of Material and Cost calculator v1b006 (xls + ods)

This release has many unlocked cells (rows at bottom and columns at right), a note to remind to change the 'Std Measure' (select cells in column I) for the people wanting to use the OXcalculator for builds larger than 1500 x 1500, a theoretical limit of V-slot (for now).

I also integrated and tweaked the stepper calculator of SteelSpinning, most a presentation level thing, as a second page to the OXcalculator (with his prior ok - a while back). There will be some further tweaking in the next release to add calculation of key GRBL parameters.

Do not hesitate to remind me if I missed anything mentioned in the last few months.

Waiting to see where I go with 40x and 50x profiles before moving into v2 of the OXcalculator: menu like selection of options, etc. It may change to a web format at that time ...