calc-inline-region: Work on active region even if called non-interactively with b=e=nil.  Add function calc-inline-starter-re used in calc-inline and calc-inline-region for identification of calc-inline lines/regions. Therewith also out-commented regions are recognized by calc-inline-region. Many more small changes such as adding units and so on.
Rename calc-inline to calc-inline-line and redefine calc-inline as calc-inline-region if region is active and calc-inline-line else.