Fix menu selection when installed version not present, and so can all…

…ow rm of active

bin/n

@@ -227,15 +227,15 @@ show_cursor() {
 #
 
 next_version_installed() {
-  list_versions_installed | grep $selected -A 1 | tail -n 1
+  list_versions_installed | grep "$selected" -A 1 | tail -n 1
 }
 
 #
 # Output version before selected.
 #
 
 prev_version_installed() {
-  list_versions_installed | grep $selected -B 1 | head -n 1
+  list_versions_installed | grep "$selected" -B 1 | head -n 1
 }
 
 #
@@ -606,10 +606,8 @@ set_quiet() {
 
 remove_versions() {
   test -z $1 && abort "version(s) required"
-  check_current_version
   while test $# -ne 0; do
     local version=${1#v}
-    [ "${BINS[$DEFAULT]}/$version" == "$active" ] && abort "cannot remove currently active version ($active)"
     rm -rf ${VERSIONS_DIR[$DEFAULT]}/$version
     shift
   done