acc: allow pseudo-variables as first parameter for functions.
acc: add documentation note indicating the use of pseudo-variables
acc: refresh README
acc: added note about MySQL InnoDB not supporting INSERT DELAYED

- reported by Daniel Tryba
acc: regenerated README
app_lua: sr.xavp.get() allow get all values of a var and <0 indx
app_lua: remove duplicate code and merge functionality for sr.xavp.get