Merge branch '157-bash-new-build-block' into 'master'

Resolve "bash: new build-block"

Closes #157

See merge request Pmodules/buildblocks!219

System/bash/build

@@ -0,0 +1,5 @@
+#!/usr/bin/env modbuild
+
+pbuild::add_to_group System
+pbuild::set_download_url "https://ftp.gnu.org/gnu/$P/$P-$V.tar.gz"
+

System/bash/files/variants

@@ -0,0 +1 @@
+bash/5.1	stable

System/bash/modulefile

@@ -0,0 +1,25 @@
+#%Module1.0
+
+module-whatis		"The GNU Project's shell."
+module-url		"http://www.gnu.org/software/bash/"
+module-license		"GNU GPL v3"
+module-maintainer	"Achim Gsell <achim.gsell@psi.ch>"
+
+module-help	"
+Bash is the GNU Project's shell. Bash is the Bourne Again SHell. Bash is
+an sh-compatible shell that incorporates useful features from the Korn
+shell (ksh) and C shell (csh). It is intended to conform to the IEEE
+POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional
+improvements over sh for both programming and interactive use. In addition,
+most sh scripts can be run by Bash without modification.
+
+The improvements offered by Bash include:
+
+ -  Command line editing
+ -  Unlimited size command history
+ -  Job Control
+ -  Shell Functions and Aliases
+ -  Indexed arrays of unlimited size
+ -  Integer arithmetic in any base from two to sixty-four
+"
+