Dpkg::Source::Quilt: Rename write_db() to save_db()

This is the normal counterpart to load actions.

scripts/Dpkg/Source/Package/V3/Quilt.pm

@@ -109,7 +109,7 @@ sub apply_patches {
 
     # Always create the quilt db so that if the maintainer calls quilt to
     # create a patch, it's stored in the right directory
-    $quilt->write_db();
+    $quilt->save_db();
 
     # Update debian/patches/series symlink if needed to allow quilt usage
     my $series = $quilt->get_series_file();

scripts/Dpkg/Source/Quilt.pm

@@ -18,7 +18,7 @@ package Dpkg::Source::Quilt;
 use strict;
 use warnings;
 
-our $VERSION = '0.01';
+our $VERSION = '0.02';
 
 use Dpkg::Gettext;
 use Dpkg::ErrorHandling;
@@ -85,7 +85,7 @@ sub load_db {
     $self->{applied_patches} = [ $self->read_patch_list($pc_applied) ];
 }
 
-sub write_db {
+sub save_db {
     my ($self) = @_;
 
     $self->setup_db();
@@ -154,7 +154,7 @@ sub push {
         die $@;
     }
     CORE::push @{$self->{applied_patches}}, $patch;
-    $self->write_db();
+    $self->save_db();
 }
 
 sub pop {
@@ -185,7 +185,7 @@ sub pop {
 
     erasedir($backup_dir);
     pop @{$self->{applied_patches}};
-    $self->write_db();
+    $self->save_db();
 }
 
 sub get_db_version {