MMapDirectory implementation
----------------------------

                 Key: LUCENENET-425
                 URL: https://issues.apache.org/jira/browse/LUCENENET-425
             Project: Lucene.Net
          Issue Type: New Feature
    Affects Versions: Lucene.Net 2.9.4g
            Reporter: Digy
            Priority: Trivial
             Fix For: Lucene.Net 2.9.4g
         Attachments: MMapDirectory.patch

Since this is not a direct port of MMapDirectory.java, I'll put it under 
"Support" and implement MMapDirectory as 
{code}
public class 
MMapDirectory:Lucene.Net.Support.MemoryMappedDirectory:Lucene.Net.Support.MemoryMappedDirectory
{
}
{code}
If a Mem-Map can not be created(for ex, if the file is too big to fit in 32 bit 
address range), it will default to FSDirectory.FSIndexInput

In my tests, I didn't see any performance gain in 32bit environment and I 
consider it as better then nothing. 

I would be happy if someone could send test results on 64bit platform.

DIGY

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