* include/glibtop/open.h (GLIBTOP_OPEN_NO_OVERRIDE):
tells `glibtop_open' to use the default server and not
to check the environment variables.
* include/glibtop/sysdeps.h (_glibtop_sysdeps):
renamed 'dummy' member to 'features'.
* include/glibtop/command.h (GLIBTOP_CMND_SYSDEPS):
added definition here.
* include/glibtop/sysdeps.h: added 'dummy' member so
'GLIBTOP_SYSDEPS_<feature>' now start with 1.
* include/glibtop/*.h: we now #define 'glibtop_get_<feature>'
as 'glibtop_get_<feature>__l' and 'glibtop_get_<feature>__r'
either as the '__p' or the '__s' function.