reworked IOstreams

- Istream and Ostream now retain backslashes when reading/writing strings.
  The previous implementation simply discarded them, except when used to
  escape a double-quote or a newline. It is now vitally important to retain
  them, eg for quoting regular expression meta-characters.

  The backslash continues to be used as an escape character for double-quote
  and newline, but otherwise get passed through "as-is" without any other
  special meaning (ie, they are *NOT* C-style strings). This helps avoid
  'backslash hell'!
  For example,
     string:   "match real dots \.+, question mark \? or any char .*"
     C-style:  "match real dots \\.+, question mark \\? or any char .*"

- combined subfiles in db/IOstreams, some had more copyright info than code
- OPstreamI.H contained only private methods, moved into OPstream.C

Are these really correct?
   IOstreams/Istream.H:#   include "HashTable.C"
   token/token.H:#define NoHashTableC

src/OpenFOAM/db/IOstreams/token/token.C

@@ -50,12 +50,13 @@ void Foam::token::parseError(const char* expected) const
 Foam::token::compound::~compound()
 {}
 
+
 // * * * * * * * * * * * * * * * * Selectors * * * * * * * * * * * * * * * * //
 
 Foam::autoPtr<Foam::token::compound> Foam::token::compound::New
 (
-    const Foam::word& compoundType,
-    Foam::Istream& is
+    const word& compoundType,
+    Istream& is
 )
 {
     IstreamConstructorTable::iterator cstrIter =
@@ -63,10 +64,9 @@ Foam::autoPtr<Foam::token::compound> Foam::token::compound::New
 
     if (cstrIter == IstreamConstructorTablePtr_->end())
     {
-        FatalErrorIn("token::compound::New(Istream&)")
-            << "Unknown compound type " << compoundType
-            << endl << endl
-            << "Valid compound types are :" << endl
+        FatalErrorIn("token::compound::New(const word&, Istream&)")
+            << "Unknown compound type " << compoundType << nl << nl
+            << "Valid compound types:" << endl
             << IstreamConstructorTablePtr_->toc()
             << abort(FatalError);
     }
@@ -77,7 +77,7 @@ Foam::autoPtr<Foam::token::compound> Foam::token::compound::New
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-bool Foam::token::compound::isCompound(const Foam::word& name)
+bool Foam::token::compound::isCompound(const word& name)
 {
     return
     (