Merge pull request #34 from SaveTheRbtz/master

examples: make eblob_merge more robust
v0.21.9
Merge pull request #35 from SaveTheRbtz/master

Examples: followup eblob_merge improvements
v0.21.10
python: fixed iteration over removed entries
python: reformatted code
python: add check for zero disk_size
python: make blob.py more robust on headers mismatch

This also fixes `recover_index_from_blob.py` broken in:
    ddd07bee0ada42ebd54f355ccc309dc0fe3d7593
    "Make eblob.py more resilient to garbage in blob files"
python: do not siliently ignore errors
python: simplified sid()