New BaseCache() class - Base class with caching. Also cache using dictionary
Caching classes now inherit from BaseClass
Caching classes now inherit from BaseClass
regression now prints exceptions if any
Correct test results for SysDiskSectorsize
Add exceptions to ProcAggregate
Tidy up docstrings for some classes
Correct test results for ProcAggregate() and ProcDiskstats()
ProcDiskstats():

    - remove arbitrary internal filter for loop and ram
    - filter earlier to increase efficienvy
    - modify internal call to SysDiskSectorsize() to use 'testroot'
    - modify internal dictionary of sector sizes
Replace lnxprocreader() with method sampler() in Base() class
Move timestamp to rawread() method in Base() class
Move sampler() count to argument of returned sampler method
Use the sampler() method in the examples
Add timing table to documentation
0.4.15