* Feature: to_float() and to_int() now can convert strings to values including units
  * Feature: Functions insert(), delete(), head(), tail() and reverse() can now operate on strings
  * Feature: Allow strings to be indexed as rvalues, returning the indexed character as string
  * Feature: Add to_val() and to_chr() functions to allow character manipulations
  * Feature: Add TODO (wish)list
  * Feature: Add relocate() function to support adhoc relative offsets
  * Fix: Several interpreter memory leaks plugged using valgrind
  * Fix: Allow delete() to delete all entries
  * Fix: Use correct source argument in insert() to insert into target
  * Fix: Fix relative arcs, specifically SVG, to use the correct movement
  * Fix: Fix arcs and circles, use global position whith undef end coord.