system.properties with initial and maximium memory for JVM
Fix log formatting
Catch blocks inspection
Index (lines metadata) moved from RAM to file

Now building an index is inefficient, but it will be improved.

Moving index from RAM to file has two main effects:
- now there is no limit for a line count. Before we had to fit index in RAM,
  so the limit for line count was about #RAM / (size of 1 line metadata). For
  degenerated files (only empty lines) we could handle only files with size
  < 1 GB.
- get command will be aprox. 2 times slower than before
	before: ~1 disk read
	now: ~2 disk reads
Script for creating big files + test dir