table .frm file
            
Problem:
========
Myisampack --join did not create the destination table .frm file. 
The user had to copy one of the source table .frm file as destination .frm 
file for mysql server to recognize. This is just 'user-friendliness' issue.
            
How it was solved
=================
After successful join and compression we copy the frm file from the first 
source table.
            
Functionality added
===================
myisampack --join=/path/t3 /path/t1 /path/t2 creates 
/path/t3.frm (which is bascially copied from first table's frm /path/t1)
      
Tests
=====
Modified myisampack.test to test two scenario's
1. Positive myisampack --join test
   In this case after the join operation is done,we test if the destination 
   table is accessible from the server
2. Positive myisampack --join test with an existing .frm file.
   We test the above case with an existing .frm file for the destination 
   table. It should return success even in this case.
3. Positive myisampack --join test with no .frm file for source tables
   We test the join operation with no .frm files for source tables. It should
   complete the join operation without any warnings and error messages
4. Negative myisampack --join test
   We test myisampack --join with existing .MYI,.MDI,.frm files for the 
   destination table. It should fail with exit status 2 in this case.