[Cook] Cook 2.28 patch (largish) to add configurable filesystem timestamp granularity

[Scott Finneran]

Hello All,

Attached is a patch to Cook 2.28 in the form of an Aegis change-set for 
the Cook development project. Please let me know if posting a regular 
patch would be useful.

The time-adjust-back feature of a cook recipe causes Cook to adjust the 
modtimes of ingredients to ensure files "appear" to be produced in the 
right order even though this may be difficult to tell (because they were 
created in the same second). As most file systems have a timestamp 
granularity of 1 second, the spacing of these files is usually 1 second 
apart.

When building Cook under Cygwin, a granularity of 2 seconds is used to 
cover the (increasingly rare?) case of systems running on a FAT32 
filesystem. NTFS has a granularity of 1 second, but as there is no easy 
way to query the filesystem type at runtime, this is a necessary evil.

This change modifies the default granularity of Cook to be 1 second on 
all platforms. It then adds a special variable timestamp_granularity 
which may be set to the number of seconds desired to override the default.

A command-line option is also added to the cooktime(1) utility 
-TSGranularity to provide the same feature.

The user-guide and man pages are also updated.

Tests are extended to cover the new functionality.

Cheers,

Scott
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