add virtual variables for tblBAS

[firaswehbe]

tblBAS.V_CENTER_LAST tblBAS.V_CENTER_MOST tblBAS.V_CENTER_FIRST

tblBAS.V_ART_INIT_D

[meridithperatikos]

I already had the functions set up to append "_cmp" to computed variables. Then for instances where I choose the first object it would append "_first_cmp" to the object's original name.

so, we have these: center_first_cmp, center_last_cmp, center_most_cmp, and art_sd_first_cmp written to: tblBAS_CMP.csv

what do you think? did you prefer the "v_" annotation?

[meridithperatikos]

sorry -- just to add a big, we can rename variables outside of the utility function if that is also helpful.