Remove panic in print_tty and return a Result

[phsym]

As suggested in #103, printstd should avoid panicking.

Thus, as an improvement, printstd now ignores errors, but doesn't return the printed table size anymore.

print_tty now returns a Result and can be used for better control.

Closes #103

[codecov]

Codecov Report

Merging #114 into master will increase coverage by 0.28%.
The diff coverage is 68.42%.

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
+ Coverage   84.11%   84.39%   +0.28%     
==========================================
  Files           5        5              
  Lines        1177     1173       -4     
==========================================
  Hits          990      990              
+ Misses        187      183       -4

Impacted Files	Coverage Δ
src/cell.rs	85.58% <ø> (ø)	⬆️
src/row.rs	91.01% <100%> (ø)	⬆️
src/utils.rs	94.5% <100%> (ø)	⬆️
src/format.rs	70.31% <100%> (ø)	⬆️
src/lib.rs	85.96% <25%> (+0.74%)	⬆️

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[dontlaugh]

I like that print_tty will return a Result.

As for the printstd method, I think exposing the error to the caller is best, so I would not use printstd at all. I guess I don't like either a) panic internally or b) hiding the error.

However, since you've changed the examples to use print_tty, I think it will help a lot of people trying to get started.

[phsym]

Well, printstd follows the philosophy of println! macro, silently ignoring errors when printing is not possible. But I guess I could also deprecate printstd with a message advising to use print_tty instead

[wfxr]

@phsym Would you mind releasing a new version to cover this change?