[patch] Support for split-storage of complex by Dense

[Jules Bergmann]

This patch primarily allows dense blocks to store complex data in split 
format:

  - New configure option: --with-complex=FORMAT
    For example, to store data in split format, '--with-complex=split'
    Right now the default is to use interleaved, i.e.
    '--with-complex=inter'.  However, on the mercury we will want to make
    the default split.

  - New Ext_data_local class that combines aspects of working_view_holder
    (that translates a global view into a local view) and Ext_data
    (that returns a pointer to a local view, potentially rearranging
    the format).  This arrangement avoids a potential extra copy
    and perform memory allocations early.

This patch also: fixes a bug in Histogram::operator().  It should return 
a view with value-type scalar_i, not with value-type T.  (Don, can you 
double-check that this is correct?)

				-- Jules
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