Fix number syntax highlighting.
Fix number syntax highlighting.

l0-mode is now perfect.

ihc/futhark,mrakgr/futhark,CulpaBS/wbBach,mrakgr/futhark,ihc/futhark,mrakgr/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark,HIPERFIT/futhark,ihc/futhark