Function: version
Class: gp
Section: programming
C-Name: pari_version
Prototype:
Help: version(): returns the PARI version as [major,minor,patch]
 'status'
Doc: Returns the current version number as a \typ{VEC} with three integer
 components: major version number, minor version number and patchlevel.
 To check against a particular version number, you can use:
 \bprog
    if (lex(version(), [2,2,0]) >= 0,
      \\ code to be executed if we are running 2.2.0 or more recent.
    ,
      \\ compatibility code
    );
 @eprog

