vsop: added optional arguments to vsop_lbr() to set the desired accuracy

* vsop: added optional arguments to vsop_lbr() to set the desired accuracy:
  * set accuracy for L,B (rad) and for R (AU) separately
  * if left out, use VSOP87 truncation values

  * minor BUGFIX: initial opowr should be large, not small (-1 -> 9)
Updated CMake files

* Updated CMake files:
  * removed -check stack from -check all - doesn't link in ifort 2013.3.174 / 14.0.3
  * removed double flags for RELWITHDEBINFO
  * upgraded standard from F2003 to F2008
planets: added arguments to specify desired accuracy to planet_position()

* planets: added arguments to specify desired accuracy to planet_position():
  * specify accuracy for heliocentric L,B and R in VSOP87
  * use VSOP87 truncation values if unspecified