- added STL-compatible resize() method.
  Should this be the primary entry point?

- made [DS]LListBase end iterators private

- token class handles both single and double quoted strings. Single quoted
  strings are used to tag regular expressions. At the moment this is just
  syntactical sugar and isn't (yet) treated differently than double-quoted
  strings.

- write output for std:string, with/without single quotes with the method
  writeQuoted(). Use distinct method name to avoid inadvertent compiler
  conversions.

- write wordRe and keyType using writeQuoted()

- coordinateSystem, cylindricalCS, sphericalCS:
  get copy with name constructor

- cylindricalCS, sphericalCS:
  can switch off default degrees

- dropped cartesianCS class (already covered by coordinateSystem) and just
  always use coordinateSystem directly.
  The dictionary runtime selection still accepts type "cartesian" as an alias,
  to provide the least surprises.

- dropped runtime selection based on origin/axis/direction (not used), but
  left runtime selection based on origin/coordinateRotation as still being
  potentially useful.

- Switch now stores its value as an unsigned char, which gives it the same
  storage requirement as bool (1 byte). The original implementation had both
  bool+word (1+XXX bytes storage), an intermediate version with bool+enum
  had 8 bytes (1+4 + boundary alignment).

- The reading code in boolIO.C and SwitchIO.C is now identical except for
  the error message. This allows Switch to accept '1', '0' as logical
  values, and allows bool to accept 'yes', 'no' etc. as logical values.

- The Switch text translation of a bool value is now true/false instead of
  on/off. This is partly personal preference, but we could also output the
  same text when writing a bool value to Ostream.

- Switch gets null and integer constructors so it feels more like bool.
  Added Switch::operator=(const bool);

- Low-level types can be used for the constructors, and low-level return
  values are used for the greatest flexibility (and speed).

- Fixed bugginess with dictionary lookup. The previous version actually used
  a bool instead of a Switch and bombed on 'on/off'.

TODO?
  perhaps don't worry about the error message and just call the Switch
  routines from bool.

- grammar in comments, namespace qualifiers, etc.

- put back debug switch (even although it is never used)
- remove stringsGlobals.C, since it is now never used

- uniform use of reinterpret_cast<foo*>(0) instead of
  reinterpret_cast<foo*>(NULL)

- make all static null() members inline since they are really only a cast:
      "*reinterpret_cast<foo*>(0)"

        static const char* const typeName;
        static int debug;

which had disappeared.

Changed dotFoam function to use null-constructed strings rather that the "null" strings.

- nice idea, but need to convince compiler that division by zero doesn't occur