[Libguestfs] [hivex PATCH] Re-allocating unused blocks before assigning new blocks

[Shreyas Khare]

Hello Richard

As discussed in the IRC channel, when merging a moderately large reg 
file (~35MB) to a hiv file (~118 MB); hivex generates a huge hiv file 
(~580 MB). These changes address that by creating a list of unallocated 
blocks and reassigning unused blocks. I used 
https://github.com/msuhanov/regf/blob/master/Windows%20registry%20file%20format%20specification.md 
as a reference for the structure of the hiv file (in addition to the 
source code itself)

Attaching the patch file.

Shreyas

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