Move files in Phabricator one level up

Summary:
- `kill_init.php` said "Moving 1000 files" - I hope that this is not some limit in `FileFinder`.
- [src/infrastructure/celerity] `git mv utils.php map.php; git mv api/utils.php api.php`
- Comment `phutil_libraries` in `.arcconfig` and run `arc liberate`.

NOTE: `arc diff` timed out so I'm pushing it without review.

Test Plan:
/D1234
Browsed around, especially in `applications/repository/worker/commitchangeparser` and `applications/` in general.

Auditors: epriestley

Maniphest Tasks: T1103

src/storage/AphrontDatabaseTransactionState.php

@@ -0,0 +1,104 @@
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Represents current transaction state of a connection.
+ *
+ * @group storage
+ */
+final class AphrontDatabaseTransactionState {
+
+  private $depth           = 0;
+  private $readLockLevel   = 0;
+  private $writeLockLevel  = 0;
+
+  public function getDepth() {
+    return $this->depth;
+  }
+
+  public function increaseDepth() {
+    return ++$this->depth;
+  }
+
+  public function decreaseDepth() {
+    if ($this->depth == 0) {
+      throw new Exception(
+        'Too many calls to saveTransaction() or killTransaction()!');
+    }
+
+    return --$this->depth;
+  }
+
+  public function getSavepointName() {
+    return 'Aphront_Savepoint_'.$this->depth;
+  }
+
+  public function beginReadLocking() {
+    $this->readLockLevel++;
+    return $this;
+  }
+
+  public function endReadLocking() {
+    if ($this->readLockLevel == 0) {
+      throw new Exception("Too many calls to endReadLocking()!");
+    }
+    $this->readLockLevel--;
+    return $this;
+  }
+
+  public function isReadLocking() {
+    return ($this->readLockLevel > 0);
+  }
+
+  public function beginWriteLocking() {
+    $this->writeLockLevel++;
+    return $this;
+  }
+
+  public function endWriteLocking() {
+    if ($this->writeLockLevel == 0) {
+      throw new Exception("Too many calls to endWriteLocking()!");
+    }
+    $this->writeLockLevel--;
+    return $this;
+  }
+
+  public function isWriteLocking() {
+    return ($this->writeLockLevel > 0);
+  }
+
+  public function __destruct() {
+    if ($this->depth) {
+      throw new Exception(
+        'Process exited with an open transaction! The transaction will be '.
+        'implicitly rolled back. Calls to openTransaction() must always be '.
+        'paired with a call to saveTransaction() or killTransaction().');
+    }
+    if ($this->readLockLevel) {
+      throw new Exception(
+        'Process exited with an open read lock! Call to beginReadLocking() '.
+        'must always be paired with a call to endReadLocking().');
+    }
+    if ($this->writeLockLevel) {
+      throw new Exception(
+        'Process exited with an open write lock! Call to beginWriteLocking() '.
+        'must always be paired with a call to endWriteLocking().');
+    }
+  }
+
+}