Split installation/removal parts in prepost-action scripts.

There are two scripts that can be used now:
	- prepost-inst: for pre/post actions at installation.
	- prepost-rm: for pre/post actions at removal.

--HG--
extra : convert_revision : 5e054758f549f5c81693b825795fbb36e2d5513a

doc/BINPKG_INFO

@@ -9,7 +9,8 @@ with bzip2 and has the following structure:
 	/var/cache/xbps/metadata/$pkgname
 	/var/cache/xbps/metadata/$pkgname/flist
 	/var/cache/xbps/metadata/$pkgname/props.plist
-	/var/cache/xbps/metadata/$pkgname/postpre-action
+	/var/cache/xbps/metadata/$pkgname/prepost-inst
+	/var/cache/xbps/metadata/$pkgname/prepost-rm
 
 Metadata info is stored in the "/var/cache/xbps/metadata/$pkgname"
 directory and two files will be always be present: flist and props.plist.
@@ -56,10 +57,8 @@ has the following structure:
 	...
 </dict>
 
-The prepost-action is an executable script/command that allows you to
-trigger any action at pre/post installation/removal of the binary
-package. If return value is not 0, the package won't be registered into
-the database.
+The prepost-* executables allows you to trigger any action
+at pre/post installation/removal of the binary package.
 
 The package's dictionary will also be written into the repository's package
 index file, that describes information about a binary package on it.

doc/TODO

@@ -5,7 +5,7 @@ xbps-src:
  * More robust and fast dependency checking.
  * $version needs to have a dot to be found by xbps.sh.
    Some packages do not have a dot on its version, like udev-130.
- * Add support to run the prepost-action scripts, so that the same actions are
+ * Add support to run the prepost-* scripts, so that the same actions are
    performed in source/bin packages.
 
 xbps-cmpver: