API clean up (part 2), plus misc changes and improvements.

- Rename regpkgs_dictionary to regpkgdb_dictionary to better describe what is is.
- Change some funcs in plist.c to return a boolean rather than int.
- Hide more internal funcs off the API.
- Simplify xbps_repository_update_pkg() and remove its second arg.
- Hide implementation details in xbps_repository_pool, now to iterate over the
  pool you have to use xbps_repository_pool_foreach and its struct
  repository_pool_index.
- Introduce xbps_{init,end}, to initialize/destroy some stuff in the library.
- Introduce xbps_dbg_printf to printf stuff for debugging purposes.
- xbps-{bin,repo}:  added -d arg to enable debugging output.
- Before checking if a config file needs to be installed or such, check that
  package contains the "conf_files" array.
- Remove obsolete dirs as well while updating packages.
- If transaction dictionary is ready remove the "missing_deps" array.

Bump XBPS_RELVER to 20101118.

--HG--
rename : lib/regpkgs_dictionary.c => lib/regpkgdb_dictionary.c

bin/xbps-repo/xbps-repo.8

@@ -2,12 +2,12 @@
 .\"     Title: xbps-repo
 .\"    Author: [see the "AUTHORS" section]
 .\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
-.\"      Date: 05/03/2010
+.\"      Date: 18/11/2010
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "XBPS\-REPO" "8" "05/03/2010" "\ \&" "\ \&"
+.TH "XBPS\-REPO" "8" "18/11/2010" "\ \&" "\ \&"
 .\" -----------------------------------------------------------------
 .\" * set default formatting
 .\" -----------------------------------------------------------------
@@ -43,6 +43,11 @@ of
 \fI/blah/cachedir\fR\&.
 .RE
 .PP
+\fB\-d\fR
+.RS 4
+Enables extra debugging output to be shown to stderr.
+.RE
+.PP
 \fB\-r\fR \fIrootdir\fR
 .RS 4
 Sets the