Add support for MAT threads and jstack -F

[mgm3746]

Add support for Eclipse MAT thread and jstack -F output.

For example:
$ sh ./yatda.sh --mat -f heap.hprof.threads
$ sh ./yatda.sh --forced -f jstack-F.out

I didn't add any logic for --mat or --forced, but it looks like both could be handled with these changes, at least for the basic "Top lines of all threads" and "Most common from first 10 lines of all threads":

$ diff yatda.sh yatda-mat-jstack-F.sh 
15,16c15,16
< DUMP_NAME="Full thread dump "
< ALL_THREAD_NAME=" nid=0x"
---
> DUMP_NAME="(Full thread dump |Attaching to process ID )"
> ALL_THREAD_NAME="( nid=0x|Thread [[:digit:]])"
45c45
< DUMP_COUNT=`grep "$DUMP_NAME" $FILE_NAME | wc -l`
< echo "Number of thread dumps: " $DUMP_COUNT > $FILE_NAME.yatda
< 
< THREAD_COUNT=`grep "$ALL_THREAD_NAME" $FILE_NAME | wc -l`
---
> DUMP_COUNT=`grep -E "$DUMP_NAME" $FILE_NAME | wc -l`
> THREAD_COUNT=`grep -E "$ALL_THREAD_NAME" $FILE_NAME | wc -l`
> if [ `expr $DUMP_COUNT` == 0 ]; then
>     if [ $THREAD_COUNT -gt 0 ]; then
>         # MAT thread output 
>         echo "Number of thread dumps: 1" > $FILE_NAME.yatda
>     fi
> else
>     echo "Number of thread dumps: " $DUMP_COUNT > $FILE_NAME.yatda
> fi
211c217,218
< grep "$ALL_THREAD_NAME" -A 2 $FILE_NAME | grep "at " | sort | uniq -c | sort -nr >> $FILE_NAME.yatda
---
> #grep "$ALL_THREAD_NAME" -A 2 $FILE_NAME | grep "at " | sort | uniq -c | sort -nr >> $FILE_NAME.yatda
> grep -E "$ALL_THREAD_NAME" -A 1 $FILE_NAME | grep -E "(at |- )" | sort | uniq -c | sort -nr >> $FILE_NAME.yatda
216c223,224
< grep "$ALL_THREAD_NAME" -A `expr $ALL_LINE_COUNT + 1` $FILE_NAME | grep "at " | sort | uniq -c | sort -nr >> $FILE_NAME.yatda
---
> #grep "$ALL_THREAD_NAME" -A `expr $ALL_LINE_COUNT + 1` $FILE_NAME | grep "at " | sort | uniq -c | sort -nr >> $FILE_NAME.yatda
> grep -E "$ALL_THREAD_NAME" -A `expr $ALL_LINE_COUNT + 1` $FILE_NAME | grep -E "(at |- )" | sort | uniq -c | sort -nr >> $FILE_NAME.yatda