build system: - don't call genstubs from configure, since Debian does not seem to have genstubs.tcl installed. Now, we pre-generate the stub files for tcl8.5 and tcl8.6 and copy the "right" version depending on the configured version.
- stick closer to TEA conventions (keep tclconfig-sh in tclconfig directory) - remove obsolete version of install-sh, copy manifested version to mongodb library - fix more configure quoting