Always use 'raw' with read builtin

Turns out that read without params supports backslash escaping; that is,
`\t` gets translated to tab and `\` at the end of line connects with
next line.  Such feature is dangerous as implicit; read should almost
never be used without this parameter.

See [Bash Hackers wiki]1] for more.

  [1]: http://wiki.bash-hackers.org/commands/builtin/read#read_without_-r

src/include/inigrep.sh

@@ -43,7 +43,7 @@ _inigrep__fltkey() {
     #
     # In listing mode, prints *key names* instead
     #
-    while IFS= read line;                           # '  key  =  val  '
+    while IFS= read -r line;                        # '  key  =  val  '
     do
         line="${line##*([[:space:]])}"              # line='key  =  val  '
         key="${line%%*([[:space:]])=*}"             # key='key'
@@ -65,7 +65,7 @@ _inigrep__fltsct() {
     local sct_ok=false
     local sct_name
     local line
-    while IFS= read line;
+    while IFS= read -r line;
     do
         if [[ $line =~ ^[[:space:]]*\[[^]]*\].* ]];     # IOW: 'spaces[name]anything'
         then
@@ -95,7 +95,7 @@ _inigrep__fltlst() {
     # Filter only section/keys/path names from the stream
     #
     local key="__NOKEY__" line="" sct="__NOSCT__"
-    while read line;
+    while read -r line;
     do
         case "$line" in
             \[*\]) sct=${line#[}; sct=${sct%]}; key=__NOKEY__     ;;
@@ -124,7 +124,7 @@ _inigrep__merge() {
     #
     local path
     debug -v strategy
-    while read path;
+    while read -r path;
     do
         test -f "$path" || continue
         case $strategy in
@@ -158,7 +158,7 @@ _inigrep__load() {
             debug -v FFOO_INIGREP_PATH
             echos "$FFOO_INIGREP_PATH" \
               | tr ':' '\n' \
-              | while read trydir;
+              | while read -r trydir;
                 do
                     test -n "$trydir" || continue
                     trypath="$trydir/$arg"
@@ -341,7 +341,7 @@ _inigrep__nl2colon() {
     #
     local idx=0     # current item index (zero-based)
     local path
-    while read path;
+    while read -r path;
     do
         test -z "$path" && continue
         test $idx -gt 0 && echo -n ':'