inline one time use macros
convert other macros to local helpers
HMM2XL(x) probably means hundredth millimetres to excel or xls.
Excels seems to use pixel and the ratio of 1/100th mm per pixel
happens to be 26.483 hmm/px @ 96dpi

Change-Id: I84de6106b24daa7bd1fb355fc9bc4c355bc285c7
Reviewed-on: https://gerrit.libreoffice.org/23478Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>