* lisp/calc/README: Mention musical notes.

* lisp/calc/README: Mention musical notes.

* lisp/calc-units.el (calc-lu-quant): Rename from
  `calc-logunits-quantity'.
  (calcFunc-lupquant): Rename from `calcFunc-powerquant'.
  (calcFunc-lufquant): Rename from `calcFunc-fieldquant'.
  (calc-db): Rename from `calc-dblevel'.
  (calcFunc-dbpower): Rename from `calcFunc-dbpowerlevel'.
  (calcFunc-dbfield): Rename from `calcFunc-dbfieldlevel'.
  (calc-np): Rename from `calc-nplevel'.
  (calcFunc-nppower): Rename from `calcFunc-nppowerlevel'.
  (calcFunc-npfield): Rename from `calcFunc-npfieldlevel'.
  (calc-lu-plus): Rename from `calc-logunits-add'.
  (calcFunc-lupadd): Rename from `calcFunc-lupoweradd'.
  (calcFunc-lufadd): Rename from `calcFunc-lufieldadd'.
  (calc-lu-minus): Rename from `calc-logunits-sub'.
  (calcFunc-lupsub): Rename from `calcFunc-lupowersub'.
  (calcFunc-lufsub): Rename from `calcFunc-lufieldsub'.
  (calc-lu-times): Rename from `calc-logunits-mul'.
  (calcFunc-lupmul): Rename from `calcFunc-lupowermul'.
  (calcFunc-lufmul): Rename from `calcFunc-lufieldmul'.
  (calc-lu-divide): Rename from `calc-logunits-div'.
  (calcFunc-lupdiv): Rename from `calcFunc-lupowerdiv'.
  (calcFunc-lufdiv): Rename from `calcFunc-lufielddiv'.

* lisp/calc/calc-ext.el (calc-init-extensions): Update the names of the
  functions being autoloaded.

* lisp/calc/calc.el   (calc-lu-power-reference): Rename from
  `calc-logunits-power-reference'.
  (calc-lu-field-reference): Rename from
  `calc-logunits-field-reference'.

* lisp/calc/calc-help (calc-l-prefix-help): Mention musical note functions.

* doc/misc/calc.texi (Logarithmic Units): Update the function names.