change wording

These aren't optional modules, they're old modules that I still support for which newer better ones exist.

Author: tjparnell

t/05.Bam-Samtools.t

@@ -13,7 +13,7 @@ BEGIN {
 		plan tests => 71;
 	}
 	else {
-		plan skip_all => 'Optional module Bio::DB::Sam not available';
+		plan skip_all => 'Alternate module Bio::DB::Sam not available';
 	}
 	## no critic
 	$ENV{'BIOTOOLBOX'} = File::Spec->catfile( $Bin, "Data", "biotoolbox.cfg" );

t/06.BigBed-UCSC.t

@@ -13,7 +13,7 @@ BEGIN {
 		plan tests => 50;
 	}
 	else {
-		plan skip_all => 'Optional module Bio::DB::BigBed not available';
+		plan skip_all => 'Alternate module Bio::DB::BigBed not available';
 	}
 	## no critic
 	$ENV{'BIOTOOLBOX'} = File::Spec->catfile( $Bin, "Data", "biotoolbox.cfg" );

t/07.BigWig-UCSC.t

@@ -13,7 +13,7 @@ BEGIN {
 		plan tests => 39;
 	}
 	else {
-		plan skip_all => 'Optional module Bio::DB::BigWig not available';
+		plan skip_all => 'Alternate module Bio::DB::BigWig not available';
 	}
 	## no critic
 	$ENV{'BIOTOOLBOX'} = File::Spec->catfile( $Bin, "Data", "biotoolbox.cfg" );

t/08.BigWigSet-UCSC.t

@@ -13,7 +13,7 @@ BEGIN {
 		plan tests => 43;
 	}
 	else {
-		plan skip_all => 'Optional module Bio::DB::BigWigSet not available';
+		plan skip_all => 'Alternate module Bio::DB::BigWigSet not available';
 	}
 	## no critic
 	$ENV{'BIOTOOLBOX'} = File::Spec->catfile( $Bin, "Data", "biotoolbox.cfg" );