Minor fixes identified through shellcheck and other tools (#350)

* fix whitespace

* fix spelling

* fix whitespace

* unify headers of tests

* fix some issues in tests, identified by shellcheck

* fix bash completions

bash completion files are not supposed to be executable

* fix some issues identified by shellcheck

Co-authored-by: Ali Karbassi <ali@karbassi.com>

todo.sh

@@ -134,7 +134,6 @@ $indentedJoinedConfigFileLocations
 		    -x
 		        Disables TODOTXT_FINAL_FILTER
 
-
 	EndOptionsHelp
 
     [ "$TODOTXT_VERBOSE" -gt 1 ] && cat <<-'EndVerboseHelp'
@@ -156,7 +155,6 @@ $indentedJoinedConfigFileLocations
 		    TODOTXT_SIGIL_VALID_PATTERN=.*  tweak the allowed chars for +p and @c
 		    TODOTXT_SIGIL_AFTER_PATTERN=""  optionally allow chars after +p / @c
 
-
 	EndVerboseHelp
         actionsHelp
         addonHelp
@@ -710,7 +708,6 @@ do
     fi
 done
 
-
 if [ -z "$TODO_ACTIONS_DIR" ] || [ ! -d "$TODO_ACTIONS_DIR" ]
 then
     TODO_ACTIONS_DIR="$HOME/.todo/actions"
@@ -788,7 +785,7 @@ ACTION=${1:-$TODOTXT_DEFAULT_ACTION}
 
 if [ $TODOTXT_PLAIN = 1 ]; then
     for clr in ${!PRI_@}; do
-        export "$clr"=$NONE
+        export "$clr"="$NONE"
     done
     PRI_X=$NONE
     DEFAULT=$NONE
@@ -1093,7 +1090,7 @@ case $action in
     SAVEIFS=$IFS
     IFS=$'\n'
 
-    # Treat each line seperately
+    # Treat each line separately
     for line in $input ; do
         _addto "$TODO_FILE" "$line"
     done
@@ -1136,7 +1133,7 @@ case $action in
         if [ "$TODOTXT_VERBOSE" -gt 0 ]; then
             getNewtodo "$item"
             echo "$item $newtodo"
-	fi
+    fi
     else
         die "TODO: Error appending task $item."
     fi
@@ -1149,7 +1146,7 @@ case $action in
     grep "^x " "$TODO_FILE" >> "$DONE_FILE"
     sed -i.bak '/^x /d' "$TODO_FILE"
     if [ "$TODOTXT_VERBOSE" -gt 0 ]; then
-	echo "TODO: $TODO_FILE archived."
+        echo "TODO: $TODO_FILE archived."
     fi
     ;;
 
@@ -1240,7 +1237,7 @@ case $action in
                 getNewtodo "$item"
                 echo "$item $newtodo"
                 echo "TODO: $item marked as done."
-	    fi
+        fi
         else
             echo "TODO: $item is already marked done."
         fi