small introspection reform: - Introspection for commands and arguments did not work for cmds defined in subpackages (such as mongodb). We keep now this information in hashtables and maintain a slim interface for this. - fix generation of pkgIndex.tcl for mongodb
build-process: - replace make.tcl by the much simpler mkIndex.tcl: * Does not use pkg_mkIndex * Does not load binary files (problem for cross compiling) * Requires package provide with constant in one line.
