bump versions of all pages with visible changes since v1.11
base: group related columns and rows Divide about halfway conveniently after decimal, and after every 8-16 rows.
common: enable perl v5.14 features everywhere Replace page-specific usage by global default.
common: drop leading 'v' in version numbers
base: include base-5 in economy comparison
base: append exact formula in titles Maths should be more universally understood than verbose English.
base: radix economy for 3 different maximums
base: common powers of two
base: adjust default selection (base20, ≤40)
base: reorganise code
base: experiment listing fractions in various number bases