Remove debugging output

[weitsang]

When run with

vv  read ./in +output=plys     \
    write +input=plys          \
        --output-format pcd    \
        --storage-type binary  \
        --output-dir ./out

A verbose output is shown. The tool should not print any messages unless explicitly asked to (e.g., add a --verbose or --progress flag).

args: ["read", "./in", "+output=plys"]
args: ["write", "+input=plys", "--output-format", "pcd", "--storage-type", "binary", "--output-dir", "./out"]
progress_recvs.len(): 2
=======================
read: 0
write: 0
=======================
Writing point cloud with point num 722286
Writing point cloud with point num 626948
Writing point cloud with point num 742078
Writing point cloud with point num 707974
Writing point cloud with point num 743140
Writing point cloud with point num 749527
Writing point cloud with point num 750107
Writing point cloud with point num 736130
Writing point cloud with point num 788165

etc

[weitsang]

Remove the debugging messages for now. Can add the flags later.

[YoHoSo]

The debugging message is removed. Should we also remove the progress message?

(base)  young@YoungMacBookPro  ~/local/vivotk   main_fix_69 ±  cargo run --bin vv -- read ./8i_dataset/red_black/ply_b/redandblack_vox10_1510.ply +output=plyb \ 
                                    to_png +input=plyb --output-dir ./tmp/
    Finished dev [unoptimized + debuginfo] target(s) in 0.51s
     Running `target/debug/vv read ./8i_dataset/red_black/ply_b/redandblack_vox10_1510.ply +output=plyb to_png +input=plyb --output-dir ./tmp/`
=======================
read: 0
to_png: 0
=======================
=======================
read: 1
to_png: 0
=======================
=======================
read: 1
to_png: 1
=======================

[weitsang]

Yes. We should follow the Unix CLI design philosophy. Debugging messages should be printed only if user explicitly ask for it.

I have removed it in commit 44087dc