Added functions wdmss() and wdmss2() to angle2string.f90

* Added functions wdmss() and wdmss2() to angle2string.f90:
  * function wdmss() returns angle in ddd.mm.ss.ss HTML format (0-360)
  * function wdmss2() returns angle in +-dd.mm.ss.ss HTML format (-180-180)