Rewrote Print class.

The old Print class couldn't print uint64 values, and featured
hand-hacked functionality better handled by snprintf().  Redid it
using snprintf(), using "[u]int[8,16,32,64]" types for more clarity,
and eliminated some private methods in favor of auxiliary functions in
Print.cpp.

Breaking compatibility with original implementation in three ways:

  - Print::print(double) is now accurate to 6 digits, rather
    than 2; this is consistent with the default behavior of the %f
    format specifier, and if you're using floating point, it's slow
    enough that you probably want the increased accuracy.

  - The only bases you can print a number to are 2, 8, 10, and
    16.  8, 10, and 16 already have format specifiers, and 2 is an
    important special case; others complicate matters unnecessarily.

  - Printing numbers in bases other than 10 treats them as
    unsigned quantities (i.e., won't print '-' characters).  This is
    more consistent with C++'s behavior for hexadecimal and octal
    literals (e.g., 0xFFFFFFFF has type uint32).

Updated HardwareSerial and USBSerial class documentation to reflect
the new behavior.

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