avoid chrono dependency, depend on proxmox 0.3.8

- remove chrono dependency

- depend on proxmox 0.3.8

- remove epoch_now, epoch_now_u64 and epoch_now_f64

- remove tm_editor (moved to proxmox crate)

- use new helpers from proxmox 0.3.8
  * epoch_i64 and epoch_f64
  * parse_rfc3339
  * epoch_to_rfc3339_utc
  * strftime_local

- BackupDir changes:
  * store epoch and rfc3339 string instead of DateTime
  * backup_time_to_string now return a Result
  * remove unnecessary TryFrom<(BackupGroup, i64)> for BackupDir

- DynamicIndexHeader: change ctime to i64

- FixedIndexHeader: change ctime to i64

src/tools.rs

@@ -8,8 +8,6 @@ use std::fs::File;
 use std::io::{self, BufRead, ErrorKind, Read};
 use std::os::unix::io::RawFd;
 use std::path::Path;
-use std::time::Duration;
-use std::time::{SystemTime, SystemTimeError, UNIX_EPOCH};
 
 use anyhow::{bail, format_err, Error};
 use serde_json::Value;
@@ -547,18 +545,6 @@ pub fn file_get_non_comment_lines<P: AsRef<Path>>(
     }))
 }
 
-pub fn epoch_now() -> Result<Duration, SystemTimeError> {
-    SystemTime::now().duration_since(UNIX_EPOCH)
-}
-
-pub fn epoch_now_f64() -> Result<f64, SystemTimeError> {
-    Ok(epoch_now()?.as_secs_f64())
-}
-
-pub fn epoch_now_u64() -> Result<u64, SystemTimeError> {
-    Ok(epoch_now()?.as_secs())
-}
-
 pub fn setup_safe_path_env() {
     std::env::set_var("PATH", "/sbin:/bin:/usr/sbin:/usr/bin");
     // Make %ENV safer - as suggested by https://perldoc.perl.org/perlsec.html