harmonize all indents to 4 spaces

[thib3113]

I've harmonized the indents level, in addition of PR : #9 .

Some times you used tabs, sometimes tabs and spaces, and sometimes just spaces .

9 convert all tabs in 8 spaces, but sometime the indent is in 4 spaces .

So, because you said you used 4 spaces in general, I've harmonized all the files, with a 4 indent .

[dsteinkopf]

@thib3113 thank you! Now we could add --hex-blob