v0.4.0

• gateway/runservice: add api to delete step logs #157
• *: write and flush header on log handlers (@sgotti) #180
• runservice: improve errors in logsHandler (@sgotti) #179
• runservice: use etcd mutex TryLock on fetching (@sgotti) #177
• gateway: add api to get log status (@camandel) #175
• *: use etcd mutex TryLock (@sgotti) #176
• datamanager: skip already applied wals in writeDataSnapshot (@sgotti) #167
• readdb: improve HandleEvents goroutine exiting (@sgotti) #172
• datamanager tests: increase etcd waitdown timeout (@sgotti) #174
• *: improve error handling (@sgotti) #169
• objectstorage: use a single package (@sgotti) #170
• datamanager: refactor ReadWal (@sgotti) #168
• datamanager: check wal previouswalsequence is correct in initEtcd (@sgotti) #165
• datamanager: don't create ost wal checkpointed files (@sgotti) #164
• datamanager: clean old data files (@sgotti) #160
• datamanager: fix index creation on multiple data files (@sgotti) #163
• services: check config only for enabled services (@camandel) #162
• datamanager: add data sequence to data file name (@sgotti) #158
• sequence: add tests for String and Parse methods (@sgotti) #159
• go.mod: update dependencies (@sgotti) #150
• run config: add tty option for run steps (@camandel) #149
• README: issue link points to templates (@camandel) #156
• objectstorage: add WriteObject tests (@sgotti) #155
• objectstorage: return object size in objectinfo (@sgotti) #154
• objectstorage posix: use limitreader only when size is specified. (@sgotti) #153
• objectstorage s3: use limitreader in write object (@sgotti) #152