Add quarantine_support configuration option

Convert the --enable-quarantine-support installation option in a
quarantine_support configuration option. When this option is enabled the
autoinit sub-command produces the module shell code with quarantine
mecahnism support. When disabled, code is generated without quarantine
support.

This way decision to have or not the quarantine mechanism code can also
be made in initrc configuration file. As a result
--enable-quarantine-support installation option new controls the default
behavior to generate or not the quarantine code, but this could now be
superseded in initrc configuration file.

Different setup cases are foreseen:
1. quarantine code has been included in module shell function, then
   quarantine_support config is disabled
   > config disablement is not effective as shell code is already set
2. quarantine code has not been included in module shell function,
   then quarantine_support config is enabled
   >  config enablement is not effective as shell code is already set
3. during module initialization, quarantine_support config is enabled in
   initrc
   > shell code generated with quarantine code
4. during module initialization, quarantine_support config is disabled
   in initrc
   > shell code generated without quarantine code
5. during module initialization, quarantine_support config is enabled by
   default or via env
   > shell code generated with quarantine code
6. during module initialization, quarantine_support config is disabled by
   default or via env
   > shell code generated with quarantine code

Author: xdelaruelle

Makefile

@@ -175,11 +175,9 @@ else
 endif
 
 ifeq ($(quarantinesupport),y)
-  setquarantinesupport :=
-  setnotquarantinesupport := \#
+  setquarantinesupport := 1
 else
-  setquarantinesupport := \#
-  setnotquarantinesupport :=
+  setquarantinesupport := 0
 endif
 
 ifeq ($(libtclenvmodules),y)
@@ -317,7 +315,6 @@ sed -e 's|@prefix@|$(prefix)|g' \
 	-e 's|@setshellstartup@|$(setsetshellstartup)|g' \
 	-e 's|@mcookieversioncheck@|$(setmcookieversioncheck)|g' \
 	-e 's|@quarantinesupport@|$(setquarantinesupport)|g' \
-	-e 's|@notquarantinesupport@|$(setnotquarantinesupport)|g' \
 	-e 's|@libtclenvmodules@|$(setlibtclenvmodules)|g' \
 	-e 's|@SHLIB_SUFFIX@|$(SHLIB_SUFFIX)|g' \
 	-e 's|@multilibsupport@|$(setmultilibsupport)|g' \

init/Makefile

@@ -109,13 +109,6 @@ ifeq ($(silentshdbgsupport),y)
 else
   silentshdbgsupportre := /@silentshdbgsupport@/d
 endif
-ifeq ($(quarantinesupport),y)
-  quarantinesupportre := s|@quarantinesupport@||g
-  notquarantinesupportre := /@notquarantinesupport@/d
-else
-  quarantinesupportre := /@quarantinesupport@/d
-  notquarantinesupportre := s|@notquarantinesupport@||g
-endif
 
 # comment entries if feature not enabled
 ifeq ($(versioning),y)
@@ -189,8 +182,6 @@ sed -e 's|@prefix@|$(prefix)|g' \
 	-e '$(appendbinpathre)' \
 	-e '$(prependbinpathre)' \
 	-e '$(silentshdbgsupportre)' \
-	-e '$(quarantinesupportre)' \
-	-e '$(notquarantinesupportre)' \
 	-e '$(usemanpathre)' \
 	-e '$(notusemanpathre)' \
 	-e $$'s|@modulerc@|$(modulerc)|g' \