Add ImperialCivil Units Schema

- units for civil engineering - ft, ft2, ft3, mph,
  and angles as degrees/minutes/seconds

src/Base/QuantityParser.l

@@ -132,6 +132,8 @@ CGRP     '\,'[0-9][0-9][0-9]
 "deg"      yylval = Quantity::Degree;              return UNIT; // degree         (internal standard angle)
 "rad"      yylval = Quantity::Radian;              return UNIT; // radian
 "gon"      yylval = Quantity::Gon;                 return UNIT; // gon
+"M"        yylval = Quantity::AngMinute;           return UNIT; // minute(Angular)
+"S"        yylval = Quantity::AngSecond;           return UNIT; // second(Angular) 
 
 "1"        yylval = Quantity(1.0);                 return ONE;
 {DIGIT}+"."?{DIGIT}*{EXPO}?                         {  yylval = Quantity(num_change(yytext,'.',','));return NUM;  }