enabling runtime argument checking for free (part 1)

[paolopas]

ECHO [ DEPENDS  a : b : c ] ;

actual behaviour

# b2

...found 1 target...

expected behaviour

# b2
jamfile.jam:1: in modules.load
*** argument error
* rule DEPENDS ( targets1 * : targets2 * )
* called with: ( a : b : c )
* extra argument c
(builtin):see definition of rule 'DEPENDS' being called
/home/pax/.local/share/b2/src/build/project.jam:586: in load-jamfile
/home/pax/.local/share/b2/src/build/project.jam:84: in load
/home/pax/.local/share/b2/src/build/project.jam:241: in project.find
/home/pax/.local/share/b2/src/build-system.jam:639: in module scope

the same goes for INCLUDES

[grafikrobot]

@paolopas if you are rummaging around.. We could use help in rewriting the code to C++. :-)

[paolopas]

oops, you were too quick, I also added support for the ALWAYS, LEAVES, NOCARE, NOTIME, NOTFILE, NOUPDATE, TEMPORARY, ISFILE, FAIL_EXPECTED, RMOLD rule arguments to this PR

[paolopas]

@grafikrobot René I'll reply to you by email